Follow-up d24df41: Undo broken upgrade of grunt-csscomb
Follow-up d24df41: Undo broken upgrade of grunt-csscomb

This rounded CSS values less than 1 to 0, which is unhelpful.
See https://github.com/csscomb/csscomb.js/issues/394 for upstream
report.

Bug: T101766
Change-Id: I21db02b16273f8e5fc4f6b126fd5777313dda850

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui