[Output Switcher] Adjust volume progress scale to decrease gap

Adjust scale from volume to progress by increasing 500, when user adjust
volume to 1551, close and open again, seekbar will be initialized to 1000,
which will have 551 gap, after this change it will be adjusted to 1500, to
decrease gap to 51.

Bug: 264841237
Test: atest MediaOutputAdapterTest MediaOutputControllerTest MediaOutputBaseDialogTest MediaOutputDialogTest
Change-Id: I61f95a79fb23065c8a767ea23be31c36a62db193
1 file changed