Bug 19920: Removed unnecessary code from C4/Members.pm

Bug 19920: Removed unnecessary code from C4/Members.pm

A seperate bug (Bug 16853) removed the subroutine used in this file. I removed the code as it had become unnecessary.

Test plan:
1. Confirm that &changepassword can't be found in C4/Members.pm

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 9f446de79128352fe5138bb22260a49254c65450)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>