ui: do *not* close panel when triggering datastore GC

this broke the view, let the panel disappear until one switched to
another and back again, let's just no close main-view panels :)

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

www/DataStoreConfig.js

@@ -47,7 +47,6 @@ Ext.define('PBS.DataStoreConfig', {
 			    upid: upid
 			});
 			win.show();
-			me.close();
 		    }
 		});
 	    }