Fixed compilation error "error: stray ‘\357’ in program" in several configuration files.

Introduced in commit 697ee2dc and later spread to other files.

Marlin/example_configurations/Felix/Configuration.h

-#ifndef CONFIGURATION_H
+#ifndef CONFIGURATION_H
 #define CONFIGURATION_H
 
 #include "boards.h"

Marlin/example_configurations/Hephestos/Configuration.h

-#ifndef CONFIGURATION_H
+#ifndef CONFIGURATION_H
 #define CONFIGURATION_H
 
 #include "boards.h"

Marlin/example_configurations/K8200/Configuration.h

-#ifndef CONFIGURATION_H
+#ifndef CONFIGURATION_H
 #define CONFIGURATION_H
 
 #include "boards.h"

Marlin/example_configurations/SCARA/Configuration.h

-#ifndef CONFIGURATION_H
+#ifndef CONFIGURATION_H
 #define CONFIGURATION_H
 
 #include "boards.h"

Marlin/example_configurations/WITBOX/Configuration.h

-#ifndef CONFIGURATION_H
+#ifndef CONFIGURATION_H
 #define CONFIGURATION_H
 
 #include "boards.h"

Marlin/example_configurations/delta/generic/Configuration.h

-#ifndef CONFIGURATION_H
+#ifndef CONFIGURATION_H
 #define CONFIGURATION_H
 
 #include "boards.h"

Marlin/example_configurations/delta/kossel_mini/Configuration.h

-#ifndef CONFIGURATION_H
+#ifndef CONFIGURATION_H
 #define CONFIGURATION_H
 
 #include "boards.h"

Marlin/example_configurations/makibox/Configuration.h

-#ifndef CONFIGURATION_H
+#ifndef CONFIGURATION_H
 #define CONFIGURATION_H
 
 #include "boards.h"

Marlin/example_configurations/tvrrug/Round2/Configuration.h

-#ifndef CONFIGURATION_H
+#ifndef CONFIGURATION_H
 #define CONFIGURATION_H
 
 #include "boards.h"