Drop keymap_metadata.h

It had the COLS & ROWS defines, which are hardware-specific, and were moved to
the hardware lib.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

src/key_events.h

@@ -2,10 +2,10 @@
 #include <Arduino.h>
 #include "KeyboardioHID.h"
 
+#include KEYBOARDIO_HARDWARE_H
 #include "key_defs.h"
 #include "keyswitch_state.h"
 #include "Storage.h"
-#include "keymap_metadata.h"
 #include "hooks.h"
 
 extern const Key keymaps[][ROWS][COLS];

src/keymap_metadata.h

@@ -1,4 +0,0 @@
-#pragma once
-
-#define COLS 16
-#define ROWS 4