head: remove Default trait from HeadOptions

[cakebaker]

I noticed that we use let mut options = Self::default(); in the constructor of HeadOptions, followed by setting all of its properties again. This PR simplifies the constructor and removes the Default trait from HeadOptions.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/cut/bounded-memory (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/pr/bounded-memory (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/date/resolution (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/tail/retry (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/printf/printf-surprise is now being skipped but was previously passing.

[cakebaker]

Changes since last push:

• rebased and fixed conflict