Fix bug where space.enter() sometimes wouldn’t return

Calling presence.enter() does not necessarily result in the presence
object emitting an ENTER event. This could happen, for example, if the
channel does not become attached quickly enough, or if a transport
upgrade is happening at roughly the same time as the presence enter call
(note that the latter possibility means that we wouldn’t gain much by
trying to work around the former by making sure the channel becomes
attached before performing the presence enter). In both these cases, the
only visible side effect of the presence enter call will be a PRESENT
event emitted as a result of a presence SYNC.

So, we update space.enter such that it also will return if it receives a
PRESENT event for the current member.

Resolves COL-335.

src/Space.ts

@@ -264,7 +264,7 @@ class Space extends EventEmitter<SpaceEventMap> {
         resolve(members);
       };
 
-      presence.subscribe('enter', presenceListener);
+      presence.subscribe(['enter', 'present'], presenceListener);
 
       const update = new SpaceUpdate({ self: null, extras: null });
       this.presenceEnter(update.updateProfileData(profileData));