gpu: ipu-v3: image-convert: Only wait for abort completion if active run

Only wait for the ctx->aborted completion if there is an active run
in progress, otherwise the wait will just timeout after 10 seconds.
If there is no active run in progress, the done queue just needs to
be emptied.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>