wm: fix APPEARANCE_LOW_PROFILE_BARS not working in non-fullscreen app

Due to invalid check, APPEARANCE_LOW_PROFILE_BARS wasn't updated without
fullscreen state changing, and APPEARANCE_LOW_PROFILE_BARS was not
applied for legacy app.

Bug: 286457057

(cherry picked from https://android-review.googlesource.com/q/commit:f029a2491d9565256d15017a17719c0a45b2d667)
Merged-In: I6d15d7796ea2d6b9fc7f4e085e8ad88c44663427
Change-Id: I6d15d7796ea2d6b9fc7f4e085e8ad88c44663427