Rename supercoder config_user to config.h

Also fixup the include path of parent config

keyboards/ergodox/keymaps/supercoder/config_user.h → keyboards/ergodox/keymaps/supercoder/config.h

@@ -1,7 +1,7 @@
 #ifndef CONFIG_USER_H
 #define CONFIG_USER_H 1
 
-#include "config.h"
+#include "../../config.h"
 
 #undef LOCKING_SUPPORT_ENABLE
 #undef LOCKING_RESYNC_ENABLE