Bump version name to 50.5 in metadata.json

Author: ChrisLauinger77

HeadsetControl@lauinger-clan.de/metadata.json

@@ -12,5 +12,5 @@
         "paypal": "ChrisLauinger"
     },
     "version": 999,
-    "version-name": "50.4"
+    "version-name": "50.5"
 }