Apply Decode As induced protocol preference changes

Make sure that pending protocol preference changes caused by Decode
As have been fully applied before redissection. Prevents referencing
already freed memory Closes #16787. Also close #10305

ui/qt/models/decode_as_model.cpp

@@ -810,6 +810,7 @@ void DecodeAsModel::applyChanges()
             }
         }
     }
+    prefs_apply_all();
 }
 
 /* * Editor modelines