Difficult to edit certain parts of the filesystem

Since the `/usr` in the flatpak sandbox is different from the host `/usr`, it's difficult to edit files there with flatpak'd vim: `org.vim.Vim /usr/etc/dracut.conf.d/endless.conf` results in vim opening a new empty file in a new directory rather than editing the file at that location on the host. Since nano is not installed via flatpak, `nano /usr/etc/dracut.conf.d/endless.conf` works fine.

A workaround is to use `org.vim.Vim /run/host/usr/etc/dracut.conf.d/endless.conf` but it would be nice to have a seamless solution to this.