coredump: normalize generation/parsing of COREDUMP_TRUNCATED=

Given that this is a field primarily processed by computers, and not so
much by humans, assign "1" instead of "yes". Also, use parse_boolean()
as we usually do for parsing it again.

This makes things more alike udev options (as one example), such as
SYSTEMD_READY where we also spit out "1" and "0", and parse with
parse_boolean().

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