hooks: disable USE_DPKG to allow localepurge to run, re-enable it afterwards

fix formatting of debug messages

config/hooks/normal/0500-localepurge.hook.chroot

@@ -1,4 +1,10 @@
 #!/bin/bash
-echo "running [$0]"
+echo "I: running $0"
 locale-gen --keep-existing
+
+# USE_DPKG must be disabled in localepurge configuration before running manually, else it will do nothing
+sed -i 's/^USE_DPKG/#USE_DPKG/' /etc/locale.nopurge
 localepurge
+
+# re-enable USE_DPKG
+sed -i 's/^#USE_DPKG/USE_DPKG/' /etc/locale.nopurge