[gnome-games] mame: Update RetroPlatform() arguments

[Alexander Mikhaylenko <alexm src gnome org>]

commit 85dab8a0fc6035a363dbf2be97eae1508cab41d5
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Sun Sep 15 22:40:48 2019 +0500

    mame: Update RetroPlatform() arguments
    
    Fixes #235

 plugins/mame/src/mame-plugin.vala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/plugins/mame/src/mame-plugin.vala b/plugins/mame/src/mame-plugin.vala
index 2e4e77a9..d3046a84 100644
--- a/plugins/mame/src/mame-plugin.vala
+++ b/plugins/mame/src/mame-plugin.vala
@@ -5,12 +5,13 @@ private class Games.MamePlugin : Object, Plugin {
        private const string SPECIFIC_MIME_TYPE = "application/x-mame-rom";
        private const string PLATFORM_ID = "MAME";
        private const string PLATFORM_NAME = _("Arcade");
+       private const string PLATFORM_UID_PREFIX = "mame";
 
        private static RetroPlatform platform;
 
        static construct {
                string[] mime_types = { SEARCHED_MIME_TYPE, SPECIFIC_MIME_TYPE };
-               platform = new RetroPlatform (PLATFORM_ID, PLATFORM_NAME, mime_types);
+               platform = new RetroPlatform (PLATFORM_ID, PLATFORM_NAME, mime_types, PLATFORM_UID_PREFIX);
        }
 
        public Platform[] get_platforms () {