bin/hydiomatic: Don't do optimᵒ by default

Remove rules/optimᵒ from the rules/default ruleset, as it can lead to
false positives. Instead, added a --experimental (or -e) option to turn
on experimental transformations, which, at the moment, is the ones in
optimᵒ.

Signed-off-by: Gergely Nagy <algernon@balabit.hu>