Remove redundant subsection title.

- Also handle opening UserProfile in LinkFlowContainer similar to how
beatmaps and channels are handled

osu.Game/Graphics/Containers/LinkFlowContainer.cs

@@ -23,16 +23,14 @@ namespace osu.Game.Graphics.Containers
         public override bool HandleMouseInput => true;
 
         private OsuGame game;
-        private UserProfileOverlay userProfile;
 
         private Action showNotImplementedError;
 
         [BackgroundDependencyLoader(true)]
-        private void load(OsuGame game, NotificationOverlay notifications, UserProfileOverlay userProfile)
+        private void load(OsuGame game, NotificationOverlay notifications)
         {
             // will be null in tests
             this.game = game;
-            this.userProfile = userProfile;
 
             showNotImplementedError = () => notifications?.Post(new SimpleNotification
             {
@@ -94,7 +92,7 @@ namespace osu.Game.Graphics.Containers
                             break;
                         case LinkAction.OpenUserProfile:
                             if (long.TryParse(linkArgument, out long userId))
-                                userProfile?.ShowUser(userId);
+                                game?.ShowUser(userId);
                             break;
                         default:
                             throw new NotImplementedException($"This {nameof(LinkAction)} ({linkType.ToString()}) is missing an associated action.");

osu.Game/OsuGame.cs

@@ -154,6 +154,12 @@ namespace osu.Game
         /// <param name="setId">The set to display.</param>
         public void ShowBeatmapSet(int setId) => beatmapSetOverlay.ShowBeatmapSet(setId);
 
+        /// <summary>
+        /// Show a user's profile as an overlay.
+        /// </summary>
+        /// <param name="userId">The user to display.</param>
+        public void ShowUser(long userId) => userProfile.ShowUser(userId);
+
         protected void LoadScore(Score s)
         {
             scoreLoad?.Cancel();

osu.Game/Overlays/Profile/Sections/RecentSection.cs

@@ -15,7 +15,7 @@ namespace osu.Game.Overlays.Profile.Sections
         {
             Children = new[]
             {
-                new PaginatedRecentActivityContainer(User, @"Recent", @"This user hasn't done anything notable recently!"),
+                new PaginatedRecentActivityContainer(User, null, @"This user hasn't done anything notable recently!"),
             };
         }
     }