Correct API version check

The version check for "av_register_all" is being performed against
the AVCodec API. Correct it to the AVFormat API.

Signed-off-by: aneejit1 <aneejit1@gmail.com>

plugins/decoder/ffmpeg/k3bffmpegwrapper.cpp

@@ -448,7 +448,7 @@ bool K3bFFMpegFile::seek(const K3b::Msf &msf) {
 //
 // av_register_all is deprecated since ffmpeg 4.0, can be dropped
 K3bFFMpegWrapper::K3bFFMpegWrapper() {
-#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(58,9,100)
+#if LIBAVFORMAT_VERSION_INT < AV_VERSION_INT(58,9,100)
   ::av_register_all();
 #endif
 }