vm: say what to do when a saved state won't restoreHEADmaster

A managed save written by libvirt 12.0.0's default raw format restores
through an fd: migration, which QEMU 11.1.2 refuses with "migrate-incoming:
fd: migration to a file is not supported. Use file: instead." The start
then fails the same way every time, and the notification only carried
that raw error, which does not say the fix is the page's own Discard
saved state button.

A start failure mentioning migrate-incoming now leads with that advice
and keeps the raw error below it. The host side was fixed separately
with save_image_format = "sparse" in qemu.conf, which restores through
file: and was checked with a managedsave and start round trip.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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