Entering an edited running game switches its mod set

New game / Load of the running game re-enter it in place only while it still
matches its collection; after the player edited the collection the mod set is
switched, so added mechanics (the editors) appear. Test suite collection_edit.

manifest.json

@@ -13,6 +13,7 @@
     {"id": "menu_flow", "activate": ["--itest=menu_flow"]},
     {"id": "save_dormancy", "activate": ["--itest=save_dormancy"]},
     {"id": "new_game", "activate": ["--itest=new_game"]},
-    {"id": "hot_reload", "activate": ["--itest=hot_reload"]}
+    {"id": "hot_reload", "activate": ["--itest=hot_reload"]},
+    {"id": "collection_edit", "activate": ["--itest=collection_edit"]}
   ]
 }