fixup! feat(conversationfolder): use per share conversation folders

fixup! feat(conversationfolder): use per share conversation folders

fix(tests): non-participant gets 404 from middleware, not 403

After moving to ChatController with #[RequireLoggedInParticipant], the
InjectionMiddleware converts ParticipantNotFoundException to OCS 404
(consistent with all other Talk endpoints).  Update the expectation.

Author: miaulalala

tests/integration/features/sharing-1/conversation-folder.feature

@@ -87,4 +87,4 @@ Feature: sharing-1/conversation-folder
       | roomType | 2    |
       | roomName | room |
     And user "participant1" adds user "participant2" to room "group room" with 200 (v4)
-    When user "participant3" posts file "welcome.txt" from their home to room "group room" with 403 (v1)
+    When user "participant3" posts file "welcome.txt" from their home to room "group room" with 404 (v1)