Bug 22003: Remove unused subroutines displaylog and GetLogStatus from C4::Log

Bug 22003: Remove unused subroutines displaylog and GetLogStatus from C4::Log

These two routines are not used

Test plan:
0) Apply the patch
1) git grep GetLogStatus should return no occurence
2) git grep displaylog should return no occurence
3) prove t/Log.t should return green

Signed-off-by: Pierre-Marc Thibault <pierre-marc.thibault@inLibro.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>