Bugfix [#25737] Console error message

It seems that rna_def_effect() is missing a rna_def_input(), resulting
in:

  rna_uiItemR: property not found:
EffectSequence.animation_offset_start
  rna_uiItemR: property not found: EffectSequence.animation_offset_end

in the console. I'm not sure whether these settings are used for
"effect" strips or not, but I'll leave that to sequencer guys to
figure out if/when they get a report about this.

source/blender/makesrna/intern/rna_sequencer.c

@@ -1344,6 +1344,7 @@ static void rna_def_effect(BlenderRNA *brna)
 
 	rna_def_filter_video(srna);
 	rna_def_proxy(srna);
+	rna_def_input(srna); // XXX: why not? [#25737]
 }
 
 static void rna_def_multicam(BlenderRNA *brna)