Reset status bar color when setting mEdgeToEdgeEnforced

mEdgeToEdgeEnforced is set during installDecor. If setStatusBarcolor is
called before mEdgeToEdgeEnforced is set, the color might be leaked.
This CL resets mStatusBarColor and mNavigationBarDividerColor to make
sure the edge-to-edge enforced as expected.

Bug: 353391346
Bug: 309578419
Flag: com.android.window.flags.enforce_edge_to_edge
Test: Open an app, targeting SDK35+, which calls setStatusBarColor
      before accessing DecorView. See if status bar color will stay
      transparent.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:c3203dde0d2335882588c6a6463f1f4acb3f475c)
Merged-In: I3661dc7c5ab79872ad9d55be522088eef2998756
Change-Id: I3661dc7c5ab79872ad9d55be522088eef2998756