[material-ui][Autocomplete] Remove popup indicator's negative right margin

[martin-trajanovski]

• [x] I have followed (at least) the PR section of the contributing guide.

Removed negative right margin on the popup indicator inside material-ui Autocomplete component

Closes https://github.com/mui/material-ui/issues/39892

[mui-bot]

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[mnajdova]

@siriwatknp, @DiegoAndai what do you think about these changes? This will help with removing horizontal scroll when the container has an overflow: auto (see the issues's Codesandbox)

[DiegoAndai]

@mnajdova Do we know what was the original intent of this margin?

[siriwatknp]

I marked this as v7