kdump-steamos: swap underscore for hyphen in filenames

Currently half of the files are hyphenated, while the rest use
underscore. Just move everything to hyphens.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>

submitter-load.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+#
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  Copyright (c) 2022 Valve.
+#
+#  This is the systemd loader for the SteamOS kdump log submitter;
+#  it's invoked by systemd, basically it just loads a detached
+#  process and exits successfuly, in order to prevent boot hangs.
+
+/usr/lib/kdump/submit-report.sh & disown
+exit 0