composer-window: remove min height

Fixes: #5
6 jobs for composer_dialog in 22 minutes and 44 seconds (queued for 6 minutes and 49 seconds)
Status Name Job ID Coverage
  Package
passed package:deb-debian-buster #304212
librem5

00:05:26

passed package:deb-debian-buster:arm64 #304213
librem5:arm64

00:14:45

passed package:deb-pureos-amber #304214
librem5

00:05:03

passed package:deb-pureos-amber-arm64 #304215
librem5:arm64

00:15:39

 
  Test Package
passed autopkgtest-debian-buster-package #304216
librem5

00:01:09

passed lintian-debian-buster-package #304217
librem5

00:00:36