Bug 17578: GetMemberDetails - Remove flags

Bug 17578: GetMemberDetails - Remove flags

Same as authflags, a flags key is set containing all the patron flags.
It is only used in a few places and it's better to call
C4::Members::patronflags when we need it.

Test plan:
Look at the diff and confirm that the change make sense
Use git grep to confirm we do not use the flags somewhere else.

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>