tdf#124480 android: Avoid using color attr requiring API 23

Using "colorBackgroundFloating" requires API level 23 [1],
but our current minimum API level is 16 (when building with
NDK 23).

Therefore, define an own color `background_floating` instead
and use the correspodning color values from the material theme
(`background_floating_material_{dark,light}` depending on whether
dark/night mode is enabled or not.

This makes the app work again in a quick test with an x86 AVD
with API level 16 instead of crashing on startup.

Change-Id: I7b8378b42e9fc7430ec4ed263d4cb8b42027a930
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/160077
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

0 files changed, 0 insertions, 0 deletions