set update interval to 60 seconds, fixes #275

VipsPlugin.php

@@ -158,7 +158,7 @@ class VipsPlugin extends StudIPPlugin implements StandardPlugin, SystemPlugin, P
                 }
             } else {
                 PageLayout::addHeadElement('script', [], '
-                    STUDIP.JSUpdater.register("vips", function(data) { location.reload(); });
+                    STUDIP.JSUpdater.register("vips", function(data) { location.reload(); }, null, 60000);
                 ');
             }
         }