updater: add button to call updateself dialog even if no next version detected

plugins/updater/init.php

@@ -341,6 +341,10 @@ class Updater extends Plugin {
 
 			} else {
 				print_notice(__("Your Tiny Tiny RSS installation is up to date."));
+
+				print "<br/> <button dojoType=\"dijit.form.Button\" onclick=\"return updateSelf()\">".
+					__('Force update')."</button></p>";
+
 			}
 
 			print "</div>"; #pane