Bug 15344: Remove some other calls of GetMemberDetails from pl scripts

Bug 15344: Remove some other calls of GetMemberDetails from pl scripts

Same as previously.
For these files it's a bit less obvious.
To make sure these changes won't introduce any regression, check that
the variable returned by GetMember is never used to get something
else than a borrower fields.
The 'flags' should not be get neither.
For opac-user.tt it's different, other keys are got but there are defined
in the pl script.

On the way:
- 'showname' is removed (never used)
- fix scope var issue in opac-user.tt (BORROWER_INF.OPACPatronDetails vs
OPACPatronDetails)

Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>