Use clean group url for redirect after editing group hompepage access

Bug #1006634, part 3

In fact, this url was previously unused, because the $redirecturl
variable was being clobbered immediately after the view type test.

Change-Id: If8695b5750599ba9ea0c62fc07f5625eafe1216a
Signed-off-by: Richard Mansfield <richard.mansfield@catalyst.net.nz>

htdocs/lib/view.php

@@ -3784,9 +3784,11 @@ class View {
         else {
             if ($this->get('group')) {
                 if ($this->get('type') == 'grouphomepage') {
-                    $redirecturl = '/group/view.php?id='.$this->get('group');
+                    $redirecturl = group_homepage_url(get_record('group', 'id', $this->get('group')));
+                }
+                else {
+                    $redirecturl = '/view/groupviews.php?group='.$this->get('group');
                 }
-                $redirecturl = '/view/groupviews.php?group='.$this->get('group');
             }
             else if ($this->get('institution')) {
                 $redirecturl = '/view/institutionviews.php?institution=' . $this->get('institution');