Sayaka: change summer alt name to "Knight of the Beach"

opponents/sayaka/meta.xml

@@ -40,7 +40,7 @@
         <tag>madoka_magica</tag>
     </tags>
     <alternates>
-        <costume folder="opponents/reskins/summertime_sayaka/" img="0-calm.png" set="summer">summertime_sayaka</costume>
+        <costume folder="opponents/reskins/summertime_sayaka/" img="0-calm.png" set="summer">Knight of the Beach</costume>
     </alternates>
     <has_collectibles>true</has_collectibles>
     <lines>1594</lines>