small fixes to group/ungropu buttons, node editor

Author: stephenfreund

src/flowco/ui/dialogs/node_editor.py

@@ -262,7 +262,7 @@ def save(self):
             page: Page = ui_page.page()
             page.clean(node.id)  # !!! this can change the page.dfg
 
-            node = node.update(phase=Phase.requirements)
+            node = node.update(phase=Phase.requirements)  
 
         dfg = ui_page.dfg()  # must reload