Fix RTL issue of ImageFloatingTextView

Sometimes, makeSingleLayout() can be invoked before layout direction is resolved.
When not resolved, it indents in LTR layout although it should be RTL.

So, to guarantee the exact indenting, we should re-build the text layout
when the layout direction is changed.

Test: manual - Test BigTextStyle notifications with LargeIcon under RTL configurations.
Fixes: 31633875
Change-Id: Idc6c5d7d41632cb9e1b70d9c67c13852e3f25023