xep-0313: use default archive preference from server

The user message archiving default retrieved from the server should be
maintained and not overridden.
7 jobs for mam_pref_fix in 8 minutes and 16 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #367869
librem5
build-pureos-gcc-byzantium

00:01:44

 
  Test
passed #367871
librem5
check-po

00:00:36

passed #367870
librem5
test:debian-gcc

00:01:32

21.6%
 
  Package
passed #367872
librem5
package-pureos-byzantium

00:01:39

passed #367873
librem5:arm64
package-pureos-byzantium:arm64

00:04:58

 
  Test Package
passed #367874
librem5
autopkgtest-pureos-byzantium-package

00:01:19

passed #367875
librem5
lintian-pureos-byzantium-package

00:00:36