Fix LaunchMultipleBubbleTest faliure when running twice

The root cause is that BubbleController#onThemeChanged inflates
the overflow bubbles unexpectedly, which leads to Bubble launch
failure.

If the overfolow bubble is inflated unexpectedly before the bubble
launch, BubbleController thought it's inflated and tried to
select and expand the bubble without updating BubbleData.

This CL fixes the issue by skipping inflation overflow bubbles
for the #onThemeChanged case.

Fix: 430273288
Test: atest LaunchMultipleBubbleTest
Test: atest DismissExpandedBubbleViaBubbleBarTest
Test: atest DismissAllCollapsedBubbleAppsTest
Test: atest WMShellRobolectricTests:BubbleControllerTest
Test: atest WMShellMultivalentTestsOnDevice:BubbleControllerTest
Flag: EXEMPT bugfix
Change-Id: I3ae0959ac50868522cc61a288d5eab25e0c01c44