Fix condition for waiting next frame

mNextFrameNumber is initiallized to 1. If we want to wait
for the first frame to be drawn, one would expect to call mSurface.waitForNextFrame(0 /* lastFrame */),
but since mNextFrameNumber is always greater then lastFrame, the method
never waits.

Test: N/A
Bug: 376248818
Bug: 376828703
Flag: EXEMPT bug fix
Change-Id: I8804479bad8102a441a95951ac27c1cc0711d7b0