[qqmusic] Eliminate _filter_lrc and use single quotes

youtube_dl/extractor/qqmusic.py

@@ -58,11 +58,6 @@ class QQMusicIE(InfoExtractor):
         curMs = int(time.time() * 1000) % 1000
         return int(round(random.random() * 2147483647) * curMs % 1E10)
 
-    def _filter_lrc(self, data):
-        lyrics_expr = r'(\[[0-9]{2}:[0-9]{2}\.[0-9]{2,}\][^\n]*|\[[^\]]*\])'
-        texts = re.findall(lyrics_expr, data)
-        return ''.join(i + "\n" for i in texts)
-
     def _real_extract(self, url):
         mid = self._match_id(url)
 
@@ -117,7 +112,9 @@ class QQMusicIE(InfoExtractor):
         self._check_formats(formats, mid)
         self._sort_formats(formats)
 
-        actual_lrc_lyrics = self._filter_lrc(lrc_content)
+        actual_lrc_lyrics = ''.join(
+            line + '\n' for line in re.findall(
+                r'(\[[0-9]{2}:[0-9]{2}\.[0-9]{2,}\][^\n]*|\[[^\]]*\])', lrc_content))
 
         info_dict = {
             'id': mid,