Users are not automatically participants anymore when asking for a file conversation

Signed-off-by: Joas Schilling <coding@schilljs.com>

tests/integration/features/conversation/lobby.feature

@@ -57,6 +57,8 @@ Feature: conversation/lobby
     Given user "participant1" shares "welcome.txt" with user "participant2" with OCS 100
     And user "participant1" gets the room for path "welcome.txt" with 200
     And user "participant2" gets the room for path "welcome (2).txt" with 200
+    And user "participant1" joins room "file welcome.txt room" with 200
+    And user "participant2" joins room "file welcome (2).txt room" with 200
     When user "participant1" sets lobby state for room "file welcome.txt room" to "non moderators" with 403
     And user "participant1" sets lobby state for room "file welcome.txt room" to "no lobby" with 403
     And user "participant2" sets lobby state for room "file welcome (2).txt room" to "non moderators" with 403