[processing] Fix crash when running model through modeler dialog

Fixes #20676

(cherry picked from commit 01de9c3)

Author: nyalldawson

python/plugins/processing/modeler/ModelerDialog.py

@@ -487,7 +487,7 @@ def runModel(self):
             self.bar.pushMessage("", self.tr("Model doesn't contain any algorithm and/or parameter and can't be executed"), level=Qgis.Warning, duration=5)
             return
 
-        dlg = AlgorithmDialog(self.model, parent=iface.mainWindow())
+        dlg = AlgorithmDialog(self.model.create(), parent=iface.mainWindow())
         dlg.exec_()
 
     def save(self):