context_processors: Stop adding unused 'submenu' to context

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>

plinth/context_processors.py

@@ -32,7 +32,6 @@ def common(request):
     ]  # Ignore the first two slashes '/plinth/apps/'
     return {
         'cfg': cfg,
-        'submenu': menu.main_menu.active_item(request),
         'active_menu_urls': active_menu_urls,
         'box_name': _(cfg.box_name),
         'user_is_admin': is_user_admin(request, True),

plinth/tests/test_context_processors.py

@@ -36,9 +36,6 @@ def test_common(Notification, load_cfg):
 
     assert response['box_name'] == 'FreedomBox'
 
-    submenu = response['submenu']
-    assert submenu is None
-
     urls = response['active_menu_urls']
     assert urls is not None
     assert ['/plinth/aaa/', '/plinth/aaa/bbb/', '/plinth/aaa/bbb/ccc/'] == urls