Get MungedDial actually working with full TS strings in it for pdb_ldap.

Get MungedDial actually working with full TS strings in it for pdb_ldap.
I know this isn't pretty, but neither was our assumption that all strings
from the directory fit inside a pstring.  There was no way this worked
before will all versions of usrmgr (for example, the only version of
mine that has the TS Confic button).
(This used to be commit d275c0e384db08c2a6efc28e52844f676ff71fb6)