Attempt fixing test flakiness by setting font scale again

For some reasons, the global configuration was not updated to
the expected font scale and therefore makes the test fail.

Set the same font scale and perform the same checks again to
avoid test flakiness.

Bug: 276177512
Test: ConfigChangeTests
Change-Id: I654121ddce55b788d2b008b8666bae8019d51aac
3 files changed