[Label] Fix Options/Add windows not reopening

When a user clicked ESC key or X button, the Options and Add windows
didn't open again. This happened because the windows were closed and
not hidden, which deleted the instance of those windows.

This fix changed the behavior of the close action to 'hide'.

deluge/plugins/Label/deluge_label/data/label.js

@@ -54,6 +54,7 @@ Deluge.ux.AddLabelWindow = Ext.extend(Ext.Window, {
     title: _('Add Label'),
     width: 300,
     height: 100,
+    closeAction: 'hide',
 
     initComponent: function() {
         Deluge.ux.AddLabelWindow.superclass.initComponent.call(this);
@@ -124,6 +125,7 @@ Deluge.ux.LabelOptionsWindow = Ext.extend(Ext.Window, {
     title: _('Label Options'),
     width: 325,
     height: 240,
+    closeAction: 'hide',
 
     initComponent: function() {
         Deluge.ux.LabelOptionsWindow.superclass.initComponent.call(this);