swscale: lower priority of swscale from 1000 -> 55, because it is broken for...

swscale: lower priority of swscale from 1000 -> 55, because it is broken for RGB formats. This way, our "native" chroma filters should take precedence. This eleviate issues with #1749 and #1762 but does NOT fix them since they are still broken for scaling.

modules/video_filter/swscale.c

@@ -61,7 +61,7 @@ const char *const ppsz_mode_descriptions[] =
 
 vlc_module_begin();
     set_description( N_("Video scaling filter") );
-    set_capability( "video filter2", 1000 );
+    set_capability( "video filter2", 55 );
     set_category( CAT_VIDEO );
     set_subcategory( SUBCAT_VIDEO_VFILTER );
     set_callbacks( OpenScaler, CloseScaler );