More deserialization fixes

Author: Morilli

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

@@ -31,10 +31,11 @@ public class RollColumn
 		public bool Rotatable { get; set; }
 
 		[JsonConstructor]
-		private RollColumn()
+		private RollColumn(string name, string text, ColumnType type)
 		{
-			Name = default!;
-			Text = default!;
+			Name = name;
+			Text = text;
+			Type = type;
 		}
 
 		public RollColumn(string name, int widthUnscaled, ColumnType type, string text)

src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudioPalette.cs

@@ -1,4 +1,5 @@
 using System.Drawing;
+using System.Text.Json.Serialization;
 
 namespace BizHawk.Client.EmuHawk
 {
@@ -49,6 +50,7 @@ public readonly struct TAStudioPalette
 
 		public readonly Color AnalogEdit_Col;
 
+		[JsonConstructor]
 		public TAStudioPalette(
 //			Color currentFrame_FrameCol,
 			Color currentFrame_InputLog,