Fix wrong url for webinar. Add logging+snackbar for onError

Signed-off-by: Julius Linus <julius.linus@nextcloud.com>
Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/java/com/nextcloud/talk/conversationinfo/ConversationInfoActivity.kt

@@ -394,7 +394,8 @@ class ConversationInfoActivity :
                 }
 
                 override fun onError(e: Throwable) {
-                    // unused atm
+                    Log.e(TAG, "Failed to setLobbyForConversation", e)
+                    Snackbar.make(binding.root, R.string.nc_common_error_sorry, Snackbar.LENGTH_LONG).show()
                 }
             })
     }

app/src/main/java/com/nextcloud/talk/utils/ApiUtils.java

@@ -247,7 +247,7 @@ public class ApiUtils {
     }
 
     public static String getUrlForRoomWebinaryLobby(int version, String baseUrl, String token) {
-        return getUrlForRoom(version, baseUrl, token) + "/webinary/lobby";
+        return getUrlForRoom(version, baseUrl, token) + "/webinar/lobby";
     }
 
     public static String getUrlForRoomNotificationCalls(int version, String baseUrl, String token) {