Update metadata.json removing last-update field

Author: claudiux

cinamp@mlandsjr/files/cinamp@mlandsjr/metadata.json

@@ -4,6 +4,5 @@
   "description": "A Music Player Desklet Similar to Classic MP3 Player Software",
   "max-instances": 1,
   "style": "stylesheet.css",
-  "prevent-decorations": false,
-  "last-edited": 1763843292
-}
+  "prevent-decorations": false
+}