Fixes css/sass variable interpolation in tom-select.default.scss

[a-maas]

trafficstars

I believe this fixes #683, where I noticed that a SASS variable didn't get replaced in the package's dist file output. I haven't used SASS/SCSS in a while so I could be wrong. I'd be happy to address this differently if there's a different way to fix this.

[a-maas]

I've confirmed that after applying this fix the css builds as expected.

Also, all tests still pass

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[mrdziuban]

@oyejorge is there any chance you could merge and release this? I ran into it as well and had to use a yarn patch to work around it