Revert "Fix text anchor for mania tooltip"

This reverts commit c0b6e78.

The change affects editor and other stuff and I'm not sure it's correct.
It's not like client needs to match the appearance really. It already
doesn't in many places.

osu.Game/Graphics/Cursor/OsuTooltipContainer.cs

@@ -80,7 +80,6 @@ public OsuTooltip()
                         Margin = new MarginPadding(5),
                         AutoSizeAxes = Axes.Both,
                         MaximumSize = new Vector2(max_width, float.PositiveInfinity),
-                        TextAnchor = Anchor.TopCentre,
                     }
                 };
             }