Fix behavior of remove in Ram Watch and Cheats too

BizHawk.Client.EmuHawk/tools/Cheats/Cheats.cs

@@ -395,9 +395,10 @@ namespace BizHawk.Client.EmuHawk
 
 		private void Remove()
 		{
-			if (SelectedItems.Any())
+			var items = SelectedItems.ToList();
+			if (items.Any())
 			{
-				foreach (var item in SelectedItems)
+				foreach (var item in items)
 				{
 					Global.CheatList.Remove(item);
 				}

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

@@ -450,9 +450,9 @@ namespace BizHawk.Client.EmuHawk
 			get { return SelectedIndices.Select(index => _searches[index]); }
 		}
 
-		private List<Watch> SelectedWatches
+		private IEnumerable<Watch> SelectedWatches
 		{
-			get { return SelectedItems.Where(x => !x.IsSeparator).ToList(); }
+			get { return SelectedItems.Where(x => !x.IsSeparator); }
 		}
 
 		private void SetRemovedMessage(int val)

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

@@ -519,9 +519,10 @@ namespace BizHawk.Client.EmuHawk
 
 		private void RemoveWatch()
 		{
-			if (SelectedItems.Any())
+			var items = SelectedItems.ToList();
+			if (items.Any())
 			{
-				foreach (var item in SelectedItems)
+				foreach (var item in items)
 				{
 					_watches.Remove(item);
 				}