[Refactor] About VRCT: ポスター画像切替関数をリファクタリング

view.py

@@ -539,8 +539,11 @@ class View():
 
             # About VRCT Tab
             CALLBACK_OPEN_WEBPAGE_ABOUT_VRCT=self.openWebPage_AboutVrct,
+
             CALLBACK_ABOUT_VRCT_POSTER_NEXT_BUTTON=None,
             CALLBACK_ABOUT_VRCT_POSTER_PREV_BUTTON=None,
+            CALLBACK_ABOUT_VRCT_POSTER_IMAGE_CURRENT_PAGE_NUM=0,
+
             CALLBACK_ABOUT_VRCT_CHANGE_POSTER_SHOWCASE_WORLD_LIST=None,
             CALLBACK_ABOUT_VRCT_POSTER_SHOWCASE_CURRENT_PAGE_NUM=0,
         )