QuickNav next menu command: adding more IA2 roles (#16670)

On some websites QuickNav command jump to next menu doesn't work. For example in Jupyter:
jupyter.org/try-jupyter/notebooks/?path=notebooks/Intro.ipynb

Description of user facing changes
QuickNav next menu command now works with Jupyter.

Description of development approach
Added one more IA2 role to search for in next menu QuickNav command.

source/virtualBuffers/gecko_ia2.py

@@ -565,7 +565,10 @@ def _searchableAttribsForNodeType(self,nodeType):
 			]
 		elif nodeType == "menuItem":
 			attrs = [
-				{"IAccessible::role": [oleacc.ROLE_SYSTEM_BUTTONMENU]}
+				{"IAccessible::role": [
+					oleacc.ROLE_SYSTEM_BUTTONMENU,
+					oleacc.ROLE_SYSTEM_MENUITEM,
+				]}
 			]
 		elif nodeType == "toggleButton":
 			attrs = [