[FIX] server: do not restart if phoenix is True (#21209)

Before this commit, saving a file being watched by watchdog
(--dev=reload) with vim (and possibly other text editors) would
crash the server via a KeyboardInterrupt error.

This happens because vim, emacs cause multiple filesystem events to
happen when saving a single file, the FSWatcher registers these events
as multiple SIGHUPs which in turn calls restart() multiple times in a
very small amount of time which makes the KeyboardInterrupts completely
shut down the server

This is fixed by only calling restart() if odoo.phoenix is False, since
catching a SIGHUP sets it to true.

Fixes #21178

Special thanks to @odony for the help :)

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