Don't complain about missing mountpoints for scripted installations.

[rpokala]

Summary

Don't bother with an interactive prompt for scripted installs; assume the person who wrote the script knew what they were doing, and proceed.

[dteske]

usr.sbin/bsdinstall/partedit/gpart_ops.c

1055–1056

"choice = 0;" can be moved above the "if (interactive) {" line to eliminate the need for an "} else {" (improves readability imho)

[rpokala]

Address dteske's comment by unconditionally setting "choice", and overriding it
for the interactive case.