Fix: Don't pass gmp object to TagDialog onSave handle

The gmp object is not part of saving a tag. Therefore it shouldn't be
put into the state of the TagDialog and passed to the onSave handler.

src/web/pages/tags/dialog.jsx

@@ -193,6 +193,7 @@ class TagDialog extends React.Component {
       resource_types = [],
       title = _('New Tag'),
       value = '',
+      gmp,
       onClose,
       onSave,
       ...options