audio VTS: Clarify numbers used by CompressedOffloadOutputStreamTest

Make more clear the origin of numbers used by the test
CompressedOffloadOutputStreamTest#Mp3FormatGaplessOffload.

No change in the test behavior.

Bug: 260676244
Test: m VtsHalAudioV7_1TargetTest
Change-Id: I48211ad4510dec7fe90dc6f755485283376eaa23
1 file changed