Don't count frame drops after resuming from a pause as a video freeze

When pausing, audio playback may continue for a brief period of time
after video pauses while the audio buffers drain. When resuming, a small
number of video frames might be dropped to catch up to the audio
position. This is acceptable behavior and should not count as a freeze.

Bug: 234833109
Bug: 306066408
Test: atest VideoRenderQualityTrackerTest
Change-Id: I14b6b6dcfd8c750dc832453b0d64a1a5e076d288