rc git: fix blame in diff of deleted/renamed files

The code paths around "Missing commit line, assume it is an uncommitted
change"  in both blame and blame-jump code look suspiciously similar.

It's possible that we can extract at least something, but there is
a fundamental difference: blame-jump only jumps to another diff,
while blame jumps from diff to blob, which may be a good reason for
keeping them separate.

More specifically, blame-jump passes « $version = "-" » because it's
only interested in the parent commit/file/line, whereas blame wants
to default to using the child commit/file/line (for added and context
lines) and only uses the parent commit/file/line when run on deleted
lines or on uncommitted changes (where HEAD is assumed to be parent
commit even if there is no child).

Unfortunately the blame path forgot to change to use the parent file
for these; fix that and get rid of some code duplication.

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