chore: standardize # style headers

Changes made with regex plus some manual tweaks.

Find:
/(?:(?<!#!\/bin\/sh\n)(?:^#\n))*^#.*?[Cc]opyright.*?(\d{4}) *([0-9A-z,_\- ]+).*?\n(?:^#\n)*^#.*?SPDX-License-Identifier:? *(.+) *?\n(?:^#\n)*/gm

Replace:
# Copyright (c) $1 $2
# SPDX-License-Identifier: $3

PR: #564

app/run-test.sh

@@ -1,9 +1,8 @@
 #!/bin/sh
-#
+
 # Copyright (c) 2020 The ZMK Contributors
-#
 # SPDX-License-Identifier: MIT
-#
+
 if [ -z "$1" ]; then
 	echo "Usage: ./run-test.sh <path to testcase>"
 	exit 1