Hide the super users group in the group select, it is always included

Author: chmst

administrator/components/com_joomlaupdate/config.xml

@@ -126,6 +126,7 @@
 			type="usergrouplist"
 			label="COM_JOOMLAUPDATE_CONFIG_AUTOUPDATE_UPDATE_EMAIL_LABEL"
 			description="COM_JOOMLAUPDATE_CONFIG_AUTOUPDATE_UPDATE_EMAIL_DESCRIPTION"
+			checksuperusergroup="0"
 			multiple="true"
 			layout="joomla.form.field.list-fancy-select"
 			showon="updatesource:default[AND]minimum_stability:4[AND]autoupdate:1"