init: fix runtime sync fallback

[xz-dev]

Example: distrobox create -i ubuntu:18.04 -n ubuntu18

Closes: #1621

[xz-dev]

❯ distrobox create -i ubuntu:18.04 -n ubuntu18
❯ distrobox enter ubuntu18
Starting container... [ OK ]
Installing basic packages... [ OK ]
Setting up devpts mounts... [ OK ]
Setting up read-only mounts...
Warning: failed to bind mount /run/host/etc/localtime to /etc/localtime using option ro,nodev
Warning: /etc/localtime integration with the host failed, runtime sync for /etc/localtime disabled.
Warning: Hard copy failed. Error: cp: '/run/host/etc/localtime' and '/etc/localtime' are the same file [ OK ]
Setting up read-write mounts... [ OK ]
Setting up host's sockets integration... [ OK ]
Integrating host's themes, icons, fonts... [ OK ]
Setting up distrobox profile... [ OK ]
Setting up sudo... [ OK ]
Setting up user's group list... [ OK ]
Setting up existing user... [ OK ]
Ensuring user's access... [ OK ]