[processing][help] use new anchor style also for modeler

Author: alexbruy

python/plugins/processing/modeler/ModelerParametersDialog.py

@@ -367,7 +367,7 @@ def openHelp(self):
         algHelp = self._alg.helpUrl()
         if not algHelp:
             algHelp = QgsHelp.helpUrl("processing_algs/{}/{}.html#{}".format(
-                self._alg.provider().helpId(), self._alg.groupId(), self._alg.name())).toString()
+                self._alg.provider().helpId(), self._alg.groupId(), "{}{}".format(self._alg.provider().helpId(), self._alg.name()))).toString()
 
         if algHelp not in [None, ""]:
             webbrowser.open(algHelp)