Enable MA0044 and fix noncompliance

"Remove useless ToString call" (on a `string`)

.global.editorconfig.ini

@@ -187,7 +187,7 @@ dotnet_diagnostic.MA0042.severity = error
 # Use nameof operator in ArgumentException
 dotnet_diagnostic.MA0043.severity = error
 # Remove useless ToString call
-dotnet_diagnostic.MA0044.severity = silent
+dotnet_diagnostic.MA0044.severity = warning
 # Do not use blocking call in a sync method (need to make containing method async)
 dotnet_diagnostic.MA0045.severity = silent
 # Use EventHandler<T> to declare events

src/BizHawk.Emulation.Cores/CPUs/ARM/Darm.cs

@@ -98,7 +98,6 @@ namespace BizHawk.Emulation.Cores.Components.ARM
 			if (Str(d, s, false))
 				return null;
 			string[] ret = Encoding.ASCII.GetString(s.total, 0, Array.IndexOf(s.total, (byte)0))
-				.ToString()
 				.Split(new string[] {" "}, 2, StringSplitOptions.None);
 			return ret[0].PadRight(8) + (ret.Length > 1 ? ret[1] : "");
 		}