Ensure first event for each rooms is a visible one

Dependening on the user's config, request for the first sync that
profile changes, membership changes or unknown events be filtered out.
This ensures we have something to show as the room subtitle (last
message) in the UI.

src/backend/nio_callbacks.py

@@ -264,7 +264,6 @@ class NioCallbacks:
         # Membership changes
         if not prev or membership != prev_membership:
             if self.client.backend.ui_settings["hideMembershipEvents"]:
-                self.client.skipped_events[room.room_id] += 1
                 return None
 
             reason = f", reason: {now['reason']}" if now.get("reason") else ""
@@ -327,7 +326,6 @@ class NioCallbacks:
                     account.avatar_url      = now.get("avatar_url") or ""
 
             if self.client.backend.ui_settings["hideProfileChangeEvents"]:
-                self.client.skipped_events[room.room_id] += 1
                 return None
 
             return (
@@ -419,7 +417,6 @@ class NioCallbacks:
 
     async def onUnknownEvent(self, room, ev) -> None:
         if self.client.backend.ui_settings["hideUnknownEvents"]:
-            self.client.skipped_events[room.room_id] += 1
             return
 
         co = f"%1 sent an unsupported <b>{ev.type}</b> event"