Remove org.freedesktop.Platform.ffmpeg-full

It has been replaced by org.freedesktop.Platform.codecs-extra
that is installed automatically

Author: AsciiWolf

org.sdrangel.SDRangel.yaml

@@ -18,14 +18,6 @@ finish-args:
   - --system-talk-name=org.freedesktop.GeoClue2
 cleanup-commands:
   - /app/cleanup-BaseApp.sh
-  - mkdir -p ${FLATPAK_DEST}/lib/ffmpeg
-add-extensions:
-  org.freedesktop.Platform.ffmpeg-full:
-    directory: lib/ffmpeg
-    add-ld-path: .
-    version: '25.08'
-    autodownload: true
-    autodelete: false
 
 modules:
   - shared-modules/linux-audio/fftw3f.json