SF: should not boost based on global touch when have category

Fixes a bug where the SF GlobalSignals.touch boost was still triggering
when there were explicit category votes such as Normal. When there are
explicit category votes, that old-style touch boost should no longer
trigger.

Bug: 327015285
Test: atest libsurfaceflinger_unittest
Change-Id: Ic87fad95089719297cebf403c0ca7717cd2741f0