ColorTool: Restore old console colors after printing the console table

Unfortunately, when you run `.\colortool.exe --current`,
you might notice that the color of the prompt printed after
the program finishes is slightly different from what it was
before you ran the program.

This changelist fixes the issue.

Testing: manual

tools/ColorTool/ColorTool/Program.cs

@@ -170,6 +170,9 @@ static void PrintTable()
 
             }
             Console.Write("\n");
+
+            Console.ForegroundColor = currentForeground;
+            Console.BackgroundColor = currentBackground;
         }
 
         static bool SetProperties(uint[] colorTable)