Add app_uuid to default settings schema.

core/default_settings/app_config.php

@@ -487,6 +487,11 @@
 		$apps[$x]['db'][$y]['fields'][$z]['type']['mysql'] = "char(36)";
 		$apps[$x]['db'][$y]['fields'][$z]['key']['type'] = "primary";
 		$z++;
+		$apps[$x]['db'][$y]['fields'][$z]['name'] = "app_uuid";
+		$apps[$x]['db'][$y]['fields'][$z]['type']['pgsql'] = "uuid";
+		$apps[$x]['db'][$y]['fields'][$z]['type']['sqlite'] = "text";
+		$apps[$x]['db'][$y]['fields'][$z]['type']['mysql'] = "char(36)";
+		$z++;
 		$apps[$x]['db'][$y]['fields'][$z]['name'] = "default_setting_category";
 		$apps[$x]['db'][$y]['fields'][$z]['type'] = "text";
 		$apps[$x]['db'][$y]['fields'][$z]['description']['en-us'] = "Enter the category.";