fix(config): newline-terminate all deployed config files

29 files under ProjectCode/ConfigFiles lacked a trailing newline. They
deploy via `cat file > target`, and several targets are subsequently
appended to (notably /etc/ssh/sshd_config, which configure_ssh_2fa
appends `AuthenticationMethods publickey,keyboard-interactive` to).
Without a trailing newline the append fused onto the last line,
producing `LoginGraceTime 60AuthenticationMethods ...`, which sshd -t
rejected as an invalid time value and aborted provisioning under errexit.

This is the same defect class that already broke the managed
authorized_keys files. Add the trailing newline to every config file
that was missing one so the cat-then-append pattern is always safe.

🤖 Generated with [Crush](https://github.com/charmassociates/crush)

Assisted-by: GLM-5 via Crush <crush@charm.land>

ProjectCode/ConfigFiles/ModProbe/usb_storage.conf

@@ -1 +1 @@
-install usb-storage /bin/true
+install usb-storage /bin/true