Fix record/play dialogs for native recordings

Resolves assertions when opening the file selection dialog windows for
recordings.

src/wx/cmdevents.cpp

@@ -1386,6 +1386,8 @@ EVT_HANDLER_MASK(RecordMovieStartRecording, "Start game recording...", CMDEN_NGR
             extno++;
         }
 
+        mov_exts.append(wxALL_FILES);
+
         if (mov_extno < 0)
             mov_extno = extno;
     }
@@ -1450,6 +1452,8 @@ EVT_HANDLER_MASK(PlayMovieStartPlaying, "Start playing movie...", CMDEN_NGREC |
             extno++;
         }
 
+        mov_exts.append(wxALL_FILES);
+
         if (mov_extno < 0)
             mov_extno = extno;
     }