[bbc] Extract better quality videos (#1113)

mobile-tablet-main only provides 540p25, so it shouldn't be used for the first attempt. Instead pc provides up to 720p50

Authored by: ajj8

yt_dlp/extractor/bbc.py

@@ -588,8 +588,8 @@ class BBCIE(BBCCoUkIE):
     _VALID_URL = r'https?://(?:www\.)?bbc\.(?:com|co\.uk)/(?:[^/]+/)+(?P<id>[^/#?]+)'
 
     _MEDIA_SETS = [
-        'mobile-tablet-main',
         'pc',
+        'mobile-tablet-main',
     ]
 
     _TESTS = [{