Fix HighHint touch signal for override.

Frame rate override was triggering even as HighHint was using touch
boost behavior in RefreshRateSelector, because the global touch signal
was not set to true. Thus set it to true, and it will not override the
touch boost.

Bug: 321107394
Test: atest libsurfaceflinger_unittest
Test: Manual youtube test and scrolling
Test: manual sysui testing
Change-Id: Ib150663db7d2f304154cf2beab9da22bb44d5d88