Revert "mouse capture: restrict to center"

This reverts commit b0b32be.

see commit discussion

Author: vadosnaprimer

src/BizHawk.Client.EmuHawk/MainForm.cs

@@ -4899,11 +4899,9 @@ private void CaptureMouse(bool wantCapture)
 		{
 			if (wantCapture)
 			{
-				var size = _presentationPanel.Control.Size;
 				var fbLocation = Point.Subtract(Bounds.Location, new(PointToClient(Location)));
 				fbLocation.Offset(_presentationPanel.Control.Location);
-				fbLocation.Offset(new Point(size.Width / 2, size.Height / 2));
-				Cursor.Clip = new(fbLocation, new(1, 1));
+				Cursor.Clip = new(fbLocation, _presentationPanel.Control.Size);
 				Cursor.Hide();
 				_presentationPanel.Control.Cursor = Properties.Resources.BlankCursor;
 				_cursorHidden = true;