[Keyboard] Clean up dactyl manuform unused files (#15890)

keyboards/handwired/dactyl_manuform/4x5/keymaps/dvorak/config.h

@@ -20,8 +20,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-#include "../../config.h"
-
 /* Use I2C or Serial, not both */
 
 #define USE_SERIAL

keyboards/handwired/dactyl_manuform/4x5/keymaps/dvorak/keymap.c

@@ -1,6 +1,4 @@
-#include "dactyl_manuform.h"
-#include "action_layer.h"
-#include "eeconfig.h"
+#include QMK_KEYBOARD_H
 
 extern keymap_config_t keymap_config;