Fix ajaxfunc "get_concerned_by" method

Followup eee88e429e72: method should be named "get_concerned_by"

cubicweb_fresh/views/__init__.py

@@ -14,7 +14,7 @@ _affk.tag_subject_of(('Expense', 'spent_for', '*'),
 
 
 @ajaxfunc(output_type='json')
-def js_get_concerned_by(self):
+def get_concerned_by(self):
     term = self._cw.form['q']
     limit = self._cw.form.get('limit', 50)
     return [{'value': eid, 'label': ref}