pp-chat-info: Set transient window

So that the file chooser dialog is properly shown
7 jobs for wip/sadiq/set-transient-for in 9 minutes and 58 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed build-pureos-gcc-byzantium #369840
librem5

00:01:48

 
  Test
passed check-po #369842
librem5

00:00:15

passed test:debian-gcc #369841
librem5

00:02:38

21.5%
 
  Package
passed package-pureos-byzantium #369843
librem5

00:01:49

passed package-pureos-byzantium:arm64 #369844
librem5:arm64

00:05:31

 
  Test Package
passed autopkgtest-pureos-byzantium-package #369845
librem5

00:01:17

passed lintian-pureos-byzantium-package #369846
librem5

00:00:36