camera2: Update partial result test to check a total result's partials

Update CaptureResultTest#testPartialResult to also test that the
list of partials returned by TotalCaptureResult#getPartialResults
matches the partials delivered by the #onCaptureProgressed callback.

Bug: 16876347
Change-Id: I80335a8533ab082ac4d5dcd2597e4181ef49f19c