mem: Remove unused counters

The database, resultset, and weakhash counters weren't used anywhere.

Re-alphabetize the counters.
13 jobs for april-maintenance in 37 minutes and 45 seconds (queued for 14 seconds)
Status Job ID Name Coverage
  Source Check
passed #31693
cppcheck

00:02:05

passed #31694
cpplint

00:02:41

passed #31695
eslint

00:07:32

passed #31692
fedora

00:03:38

 
  Test
passed #31696
fedora_clang

00:04:36

 
  Thorough Tests
passed #31699
coverage

00:24:23

passed #31698
installed_tests

00:01:51

manual #31703
allowed to fail manual
lts
manual #31702
allowed to fail manual
no_graphics
passed #31697
no_profiler

00:07:20

passed #31700
sanitizer_gcc

00:10:27

manual #31701
allowed to fail manual
valgrind
 
  Delivery
manual #31704
allowed to fail manual
packaging