settings-dialog: Remove unused options

Changing these options make no change as we don't indicate
Idle/Unknown contacts differently
9 jobs for wip/sadiq/settings-strings in 11 minutes and 38 seconds
Status Name Job ID Coverage
  Build
passed build-pureos-gcc-byzantium #376924
librem5

00:02:18

passed build-pureos-gcc-byzantium-no-purple #376940
librem5

00:01:43

failed build-pureos-gcc-byzantium-no-purple #376923
librem5

00:00:16

 
  Test
passed check-po #376926
librem5

00:00:22

passed test:debian-gcc #376925
librem5

00:01:55

19.0%
 
  Package
passed package-pureos-byzantium #376927
librem5

00:01:42

passed package-pureos-byzantium:arm64 #376928
librem5:arm64

00:05:39

 
  Test Package
passed autopkgtest-pureos-byzantium-package #376929
librem5

00:01:09

passed lintian-pureos-byzantium-package #376930
librem5

00:01:02