Revert "avfilter/vf_idet: reduce noisyness if the filter has been auto inserted"
This reverts commit
723c37d3b7b5555f23bfdfe3e5c3599543c06332.
Said commit was in preparation for auto-inserting the idet filter.
This has never happened; even if it did, the code is wrong, because
it segfaults if the filter instance doesn't have a name (having one
is not mandatory). Furthermore, it is documented for libavfilter to
not assign any semantics to the name, which this check violates.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>