Remove unnecessary CSS border-box vendor prefixes

border-box has been supported natively in web browsers since Chromium
10, Firefox 29.0, Internet Explorer 8, Opera 7, Safari (WebKit) 5.1. IE
never also had a vendor prefix.

As a guideline, as of today Firefox ESR (extended support release) is on
version 38.3.0, so native support has been available for a long while.

These vendor prefixes are no longer needed. This commit removes them.

For future improvement, matching this rule against wildcard `*` should
be re-considered and moved to body or some other rule to avoid expensive
CSS calculations.

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