Issue #4721 - Ordering of default MyPaint Brushes directories...

...is inconsistent

List the folder in the user's home first, like with other data types.

(cherry picked from commit 1e8923e184)

app/config/gimpcoreconfig.c

@@ -318,8 +318,8 @@ gimp_core_config_class_init (GimpCoreConfigClass *klass)
 #endif
 
   path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
-                       mypaint_brushes,
                        "~/.mypaint/brushes",
+                       mypaint_brushes,
                        NULL);
   g_free (mypaint_brushes);