core: don't include /boot in effect of ProtectSystem=

This would otherwise unconditionally trigger any /boot autofs mount,
which we probably should avoid.

ProtectSystem= will now only cover /usr and (optionally) /etc, both of
which cannot be autofs anyway.

ProtectHome will continue to cover /run/user and /home. The former
cannot be autofs either. /home could be, however is frequently enough
used (unlikey /boot) so that it isn't too problematic to simply trigger
it unconditionally via ProtectHome=.

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