Remove redundant subsection title.

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

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!"),
             };
         }
     }