[core] Graph: add missing GraphModification

In `initFromTemplate`, ensure that Publish nodes removal are grouped
under the same graph modification to trigger updates only once.

meshroom/core/graph.py

@@ -258,6 +258,7 @@ class Graph(BaseObject):
         self._deserialize(Graph._loadGraphData(filepath))
 
         if not publishOutputs:
+            with GraphModification(self):
                 for node in [node for node in self.nodes if node.nodeType == "Publish"]:
                     self.removeNode(node.name)