-idle: don't lazy-unmount

When a process has its working dir inside the mount,
the only way we notice is that we get EBUSY when trying
to unmount.

We used to lazy-unmount in this case, but this means
pulling the rug from under the process.

For example, bash will start throwing

  cd: error retrieving current directory: getcwd: cannot access parent directories: No such file or directory

messages.

Fixes https://github.com/rfjakob/gocryptfs/issues/533

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