Fix: mis-spelled userReactions feature (#231)

"Update feature enum for BBB 3.0" (#225)
introduced new cases for the Feature enum.

The BBB feature 'userReactions' was mis-spelled and included as
'userActions' (case USER_ACTIONS).

Add the correct USER_REACTIONS case with value 'userReactions'.

Keep the wrong USER_ACTIONS case to not break existing (changing its
value to userReactions is not possible as PHP enums do not allow
duplicate values).

See https://docs.bigbluebutton.org/development/api/#updates-to-api-in-bigbluebutton

Author: gkralik

src/Enum/Feature.php

@@ -56,7 +56,9 @@ enum Feature: string
     case REPLY_CHAT_MESSAGE = 'replyChatMessage';
     case CHAT_MESSAGE_REACTIONS = 'chatMessageReactions';
     case RAISE_HAND = 'raiseHand';
+    /** @deprecated BC only. Use Feature::USER_REACTIONS instead. */
     case USER_ACTIONS = 'userActions';
+    case USER_REACTIONS = 'userReactions';
     case CHAT_EMOJI_PICKER = 'chatEmojiPicker';
     case QUIZZES = 'quizzes';
 }