Simplify the test step after changing navigation mode

Since the related changes of [1], the display configuration change
can take effect with navigation mode change (resource overlay change).
It no longer needs to start an additional activity to refresh the
display configuration.

[1]: Id7b7f4f7a647edd51b4d3255131eb2052f403784

Bug: 275566237
Test: FlickerTests
Change-Id: Ib87ac970c5546cb2d999247a216a1b62d89092f8