maps: sort icon labels in new layer page (#21567)

combo/apps/maps/forms.py

@@ -50,6 +50,12 @@ class MapNewLayerForm(forms.ModelForm):
                    }
 
 
+    def __init__(self, *args, **kwargs):
+        super(MapNewLayerForm, self).__init__(*args, **kwargs)
+        self.fields['icon'].choices = list(
+                sorted(self.fields['icon'].choices, key=lambda x: force_text(x[1])))
+
+
 class MapLayerForm(forms.ModelForm):
     class Meta:
         model = MapLayer