[fix] move engines gpodder and AZlyrics into category music

Closes: https://github.com/searxng/searxng/issues/600
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/settings.yml

@@ -707,7 +707,7 @@ engines:
     title_query: title
     content_query: description
     page_size: 19
-    categories: social media, files, general
+    categories: music
     disabled: true
     about:
       website: https://gpodder.net
@@ -859,7 +859,7 @@ engines:
     engine: xpath
     timeout: 4.0
     disabled: true
-    categories: general
+    categories: music
     paging: true
     search_url: https://search.azlyrics.com/search.php?q={query}&w=lyrics&p={pageno}
     url_xpath: //td[@class="text-left visitedlyr"]/a/@href