NuPlayer2Decoder: Count all nuplayer frames

nuplayer counts frames: both total and dropped. One path during
intentional skipping counted those frames as dropped, but not as
part of the total. This moves the accumulation of total frames up
to a point where it will also include these intentionally
skipped/dropped frames.

Bug: 70297008
Test: manual
Change-Id: I0f56c1edd949e937c85ff2392415b61bf7422a55