タグ削除チェックは大文字に変換して行ふやぅ修正

update_db.py

@@ -160,7 +160,7 @@ def update_tables (
             for vt in video_tags:
                 tag = tag_dao.find (vt.tag_id)
                 if (tag is not None
-                        and (tag.name not in tag_names)
+                        and (tag.name.upper () not in [tn.upper () for tn in tag_names])
                         and (tag.id_ is not None)):
                     tag_ids.append (tag.id_)
             video_tag_dao.untag_all (video.id_, tag_ids, now)