.desktop file: the MimeType entry must ends with a semi colon

Also remove some comments

mirall.desktop.in

@@ -8,192 +8,7 @@ GenericName=Folder Sync
 Icon=@APPLICATION_ICON_NAME@
 Keywords=@APPLICATION_NAME@;syncing;file;sharing;
 X-GNOME-Autostart-Delay=3
-MimeType=application/x-@APPLICATION_EXECUTABLE@
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+MimeType=application/x-@APPLICATION_EXECUTABLE@;
 
 # Translations
 Comment[oc]=@APPLICATION_NAME@ sincronizacion del client