sysmocom-backup: Fix creating of back-ups for external files

* The file we install is called default.files and not *.backup
* Spotted by Lazlo while creating a backup on the latest system

recipes-apps/sysmocom-backup/files/sysmocom-backup

@@ -7,7 +7,7 @@ FILES="etc/sysmocom/backup.d"
 
 # Pick some extra files
 if [ -e /etc/sysmocom/backup.d/ ]; then
-	for extra in `ls /etc/sysmocom/backup.d/*.backup`;
+	for extra in `ls /etc/sysmocom/backup.d/*.files`;
 	do
 		echo "Add extras from $extra."
 		FILES="$FILES `cat $extra`"

recipes-apps/sysmocom-backup/sysmocom-backup_1.0.bb

@@ -1,7 +1,7 @@
 DESCRIPTION = "sysmocom config backup and restore scripts"
 LICENSE = "GPLv3+"
 LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
-PR = "r12"
+PR = "r13"
 
 SRC_URI = " \
 	file://sysmocom-backup \