Follow-up fixes to ag/21609953

- Window title seems to matter only for layout inspectors, all other windows in sysui also have non-resource name. Also checked that Talkback doesn't announce this title
- Changed getColor(resource) to getColor(resource, theme) and passed theme (null would also work, it doesn't really matter for now)

Bug: 268650355
Test: backlight dialog still works
Change-Id: Id6660f5dcc7f9deea10033583e2b760d2a55bf3a