Use WAIT_FOR_SCAN_LINE instead of WAIT_FOR_VBLANK

Either way, the goal is tear-free video playing. But waiting for
a scan-line window not only has the advantage of being cheaper
for small windows, but also avoids hanging the GPU in the case
of the pipe getting turned off, (by screensaver, for example),
while a batch is waiting for a VBLANK that will never occur.

This fixes that GPU hang.

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