window: Reduce minimum height

So that the chat view message entry is shown in landscape mode better
when osk is shown
7 jobs for wip/sadiq/small-height in 8 minutes and 30 seconds (queued for 1 second)
latest
Status Name Job ID Coverage
  Build
passed build-pureos-gcc-byzantium #376415
librem5

00:01:52

 
  Test
passed check-po #376417
librem5

00:00:18

passed test:debian-gcc #376416
librem5

00:01:39

20.7%
 
  Package
passed package-pureos-byzantium #376418
librem5

00:01:45

passed package-pureos-byzantium:arm64 #376419
librem5:arm64

00:04:59

 
  Test Package
passed autopkgtest-pureos-byzantium-package #376420
librem5

00:01:23

passed lintian-pureos-byzantium-package #376421
librem5

00:00:37