Remove unused props from `RollColumn` and `RollColumns`

src/BizHawk.Client.EmuHawk/CustomControls/InputRoll/InputRoll.Drawing.cs

@@ -88,11 +88,7 @@ namespace BizHawk.Client.EmuHawk
 			{
 				RollColumn col = visibleColumns[j];
 				int height = CellHeight;
-				if (col.Rotatable && col.RotatedHeight != null)
-				{
-					height = Math.Max(height, col.RotatedHeight.Value);
-				}
-				else if (col.Rotatable)
+				if (col.Rotatable)
 				{
 					int strOffsetX = 0;
 					int strOffsetY = 0;

src/BizHawk.Client.EmuHawk/CustomControls/InputRoll/RollColumn.cs

@@ -2,7 +2,6 @@
 {
 	public class RollColumn
 	{
-		public string Group { get; set; }
 		public int Width { get; set; }
 		public int Left { get; set; }
 		public int Right { get; set; }
@@ -23,11 +22,6 @@
 		/// </summary>
 		public bool Rotatable { get; set; }
 
-		/// <summary>
-		/// If drawn rotated, specifies the desired height, or null to auto-size
-		/// </summary>
-		public int? RotatedHeight { get; set; }
-
 		/// <summary>
 		/// Sets the desired width as appropriate for a display with no scaling. If display
 		/// scaling is enabled, the actual column width will be scaled accordingly.

src/BizHawk.Client.EmuHawk/CustomControls/InputRoll/RollColumns.cs

@@ -106,9 +106,5 @@ namespace BizHawk.Client.EmuHawk
 			base.Clear();
 			ColumnsChanged();
 		}
-
-		public IEnumerable<string> Groups => this
-			.Select(x => x.Group)
-			.Distinct();
 	}
 }