dynamic.conf: avoid nested brackets [ [ ] ] in john --test output

There were just 3 dynamic formats using brackets in their
Expression.
This caused john --test output to contain nested brackets.
Nested brackets in john --test output would require more
jumbo specific adjustments in relbench which are not needed
in the core version.

Instead of adjusting relbench, change the dynamic format expressions.

The new output
	sha1(unicode($p)) (Microsoft CREDHIST)
instead of
	sha1(unicode($p)) [Microsoft CREDHIST]
follows the "syntax" used for other dynamic formats:
	md5($p) (raw-md5)
	md5($p.$s) (joomla)
	md5(md5($p)) (e107)
	md5($s.$p) (OSC)
	md5(md5($s).md5($p)) (IPB)
	md5($p.$s) (RADIUS User-Password)
etc.