g2meet: Respect cursor_stride properly everywhere

This fixes a regression with rgb cursors since b1e46988.

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  g2meet: Respect cursor_stride properly everywhere

See: c88ac1e0233f34582312dc617261b9270b61df19
Merged-by: Michael Niedermayer <michaelni@gmx.at>
avformat/mpegenc: minor simplification / use AV_WB16()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>