issue #588 can't add feeds to collections using connedit page group sidebar widget

mod/contactgroup.php

@@ -10,7 +10,7 @@ function contactgroup_content(&$a) {
 
 	if((argc() > 2) && (intval(argv(1))) && (argv(2))) {
 		$r = q("SELECT abook_xchan from abook where abook_xchan = '%s' and abook_channel = %d and not ( abook_flags & %d ) limit 1",
-			dbesc(argv(2)),
+			dbesc(base64url_decode(argv(2))),
 			intval(local_user()),
 			intval(ABOOK_FLAG_SELF)
 		);