Fix Talkback hover state for toggle seekbar

We only want to override specific cases for ToggleSeekbar i.e. ACTION_HOVER_ENTER or ACTION_HOVER_EXIT, other onHoverEvent should remain its default behaviour

Bug: 364746026
Flag: NONE bug fix
Test: Turn on Talkback, then connect a touchpad and hover the cursor on BrightnessSlider
Change-Id: I69d49054a3082b257b71aa6c5d87c5a47a071885