Eliminate use of #include "../default/keymap.c". (#24215)

keyboards/wilba_tech/wt20_h1/keymaps/via/keymap.c

@@ -1,4 +1,14 @@
 // Copyright 2024 Jason Williams (@wilba)
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-#include "../default/keymap.c"
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [0] = LAYOUT_ortho_5x4(
+    KC_NUM,  KC_PSLS, KC_PAST, KC_PMNS,
+    KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
+    KC_P4,   KC_P5,   KC_P6,   KC_PPLS,
+    KC_P1,   KC_P2,   KC_P3,   KC_PENT,
+    KC_P0,   KC_P0,   KC_PDOT, KC_PENT
+  ),
+};