Collapse group with root svg element

[mahnunchik]

Describe the bug

It would produce smaller output svg if groups are collapsed with root svg element too.

To Reproduce

1. Run svgo with default plugins on image: https://gist.githubusercontent.com/mahnunchik/be61d130adc9f190cdccd2c337e71c9a/raw/da7c807edbbb440fba8a22404051a60289537ccb/icon.svg

 npx svgo -i input.svg -o output.svg --pretty

Actual behavior

<svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" shape-rendering="geometricPrecision" text-rendering="geometricPrecision" image-rendering="optimizeQuality" fill-rule="evenodd" clip-rule="evenodd" viewBox="0 0 4091.27 4091.73">
    <g fill-rule="nonzero">
        <path fill="#F7931A" d="M4030.06 2540.77C3756.82 3636.78 2646.74 4303.79 1550.6 4030.48 454.92 3757.24-212.09 2647.09 61.27 1551.17c273.12-1096.13 1383.2-1763.19 2479-1489.95C3636.33 334.46 4303.3 1444.73 4030.03 2540.79l.02-.02z"/>
        <path fill="#fff" d="M2947.77 1754.38c40.72-272.26-166.56-418.61-450-516.24l91.95-368.8-224.5-55.94-89.51 359.09c-59.02-14.72-119.63-28.59-179.87-42.34L2186 768.69l-224.36-55.94-92 368.68c-48.84-11.12-96.81-22.11-143.35-33.69l.26-1.16-309.59-77.31-59.72 239.78s166.56 38.18 163.05 40.53c90.91 22.69 107.35 82.87 104.62 130.57l-104.74 420.15c6.26 1.59 14.38 3.89 23.34 7.49-7.49-1.86-15.46-3.89-23.73-5.87l-146.81 588.57c-11.11 27.62-39.31 69.07-102.87 53.33 2.25 3.26-163.17-40.72-163.17-40.72l-111.46 256.98 292.15 72.83c54.35 13.63 107.61 27.89 160.06 41.3l-92.9 373.03 224.24 55.94 92-369.07c61.26 16.63 120.71 31.97 178.91 46.43l-91.69 367.33 224.51 55.94 92.89-372.33c382.82 72.45 670.67 43.24 791.83-303.02 97.63-278.78-4.86-439.58-206.26-544.44 146.69-33.83 257.18-130.31 286.64-329.61l-.07-.05zm-512.93 719.26c-69.38 278.78-538.76 128.08-690.94 90.29l123.28-494.2c152.17 37.99 640.17 113.17 567.67 403.91zm69.43-723.3c-63.29 253.58-453.96 124.75-580.69 93.16l111.77-448.21c126.73 31.59 534.85 90.55 468.94 355.05h-.02z"/>
    </g>
</svg>

Expected behavior

<svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" shape-rendering="geometricPrecision" text-rendering="geometricPrecision" image-rendering="optimizeQuality" fill-rule="nonzero" clip-rule="evenodd" viewBox="0 0 4091.27 4091.73">
    <path fill="#F7931A" d="M4030.06 2540.77C3756.82 3636.78 2646.74 4303.79 1550.6 4030.48 454.92 3757.24-212.09 2647.09 61.27 1551.17c273.12-1096.13 1383.2-1763.19 2479-1489.95C3636.33 334.46 4303.3 1444.73 4030.03 2540.79l.02-.02z"/>
    <path fill="#fff" d="M2947.77 1754.38c40.72-272.26-166.56-418.61-450-516.24l91.95-368.8-224.5-55.94-89.51 359.09c-59.02-14.72-119.63-28.59-179.87-42.34L2186 768.69l-224.36-55.94-92 368.68c-48.84-11.12-96.81-22.11-143.35-33.69l.26-1.16-309.59-77.31-59.72 239.78s166.56 38.18 163.05 40.53c90.91 22.69 107.35 82.87 104.62 130.57l-104.74 420.15c6.26 1.59 14.38 3.89 23.34 7.49-7.49-1.86-15.46-3.89-23.73-5.87l-146.81 588.57c-11.11 27.62-39.31 69.07-102.87 53.33 2.25 3.26-163.17-40.72-163.17-40.72l-111.46 256.98 292.15 72.83c54.35 13.63 107.61 27.89 160.06 41.3l-92.9 373.03 224.24 55.94 92-369.07c61.26 16.63 120.71 31.97 178.91 46.43l-91.69 367.33 224.51 55.94 92.89-372.33c382.82 72.45 670.67 43.24 791.83-303.02 97.63-278.78-4.86-439.58-206.26-544.44 146.69-33.83 257.18-130.31 286.64-329.61l-.07-.05zm-512.93 719.26c-69.38 278.78-538.76 128.08-690.94 90.29l123.28-494.2c152.17 37.99 640.17 113.17 567.67 403.91zm69.43-723.3c-63.29 253.58-453.96 124.75-580.69 93.16l111.77-448.21c126.73 31.59 534.85 90.55 468.94 355.05h-.02z"/>
</svg>

• fill-rule="nonzero" moved to svg element
• Group collapsed.

Desktop (please complete the following information):

• SVGO Version: 2.7.0-2.8.0
• NodeJs Version: v14.18.2
• OS: macOS 12.1