fix dynesty sample method logging messages

As reported a while ago in #688 (closed), the logging messages are confusing because it always says it's using "rwalk" even if another option is picked. When first switching to bilby2+, this made us think for a while our configs were wrong.

• closes #688 (closed)

approved this merge request

approved this merge request

Thanks @david-keitel

added <10 lines Bug labels

merged

changed milestone to %2.2.1

mentioned in merge request !1305 (merged)