[Keyboard] Code updates for macro3 (#15280)

Co-authored-by: filterpaper <filterpaper@localhost>

keyboards/macro3/post_config.h

@@ -0,0 +1,17 @@
+/* Copyright 2020 David Philip Barr <@davidphilipbarr>
+ * Copyright 2021 @filterpaper
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/* Top right key */
+#ifndef BOOTMAGIC_LITE_ROW
+#    define BOOTMAGIC_LITE_ROW 0
+#endif
+#ifndef BOOTMAGIC_LITE_COLUMN
+#    define BOOTMAGIC_LITE_COLUMN 3
+#endif
+
+#ifndef ENCODER_RESOLUTION
+#    define ENCODER_RESOLUTION 2
+#endif
+