Remove duplicate method in `CheatList`

src/BizHawk.Client.Common/tools/CheatList.cs

@@ -205,12 +205,6 @@ namespace BizHawk.Client.Common
 			Changes = true;
 		}
 
-		public void RemoveAll()
-		{
-			_cheatList.Clear();
-			Changes = true;
-		}
-
 		public void Clear()
 		{
 			_cheatList.Clear();

src/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs

@@ -1638,7 +1638,7 @@ namespace BizHawk.Client.EmuHawk
 
 		private void UnfreezeAllMenuItem_Click(object sender, EventArgs e)
 		{
-			MainForm.CheatList.RemoveAll();
+			MainForm.CheatList.Clear();
 		}
 
 		private void PokeAddressMenuItem_Click(object sender, EventArgs e)
@@ -1884,7 +1884,7 @@ namespace BizHawk.Client.EmuHawk
 				case Keys.Delete:
 					if (e.Modifiers == Keys.Shift)
 					{
-						MainForm.CheatList.RemoveAll();
+						MainForm.CheatList.Clear();
 					}
 					else
 					{

src/BizHawk.Client.EmuHawk/tools/Watch/RamSearch.cs

@@ -1377,7 +1377,7 @@ namespace BizHawk.Client.EmuHawk
 
 		private void UnfreezeAllContextMenuItem_Click(object sender, EventArgs e)
 		{
-			MainForm.CheatList.RemoveAll();
+			MainForm.CheatList.Clear();
 		}
 
 		private void ViewInHexEditorContextMenuItem_Click(object sender, EventArgs e)

src/BizHawk.Client.EmuHawk/tools/Watch/RamWatch.cs

@@ -1169,7 +1169,7 @@ namespace BizHawk.Client.EmuHawk
 
 		private void UnfreezeAllContextMenuItem_Click(object sender, EventArgs e)
 		{
-			MainForm.CheatList.RemoveAll();
+			MainForm.CheatList.Clear();
 		}
 
 		private void ViewInHexEditorContextMenuItem_Click(object sender, EventArgs e)