flatpak: disable mobile-broadband-provider-info

Without this flag at false network-manager-applet requires the
mobile-broadband-provider-info dependency that is not listed in this
flatpak
11 jobs for flat_fix in 4 minutes and 20 seconds (queued for 2 minutes and 49 seconds)
latest
Status Job ID Name Coverage
  Build
passed #107040
build

00:01:53

 
  Test
passed #107042
asan

00:01:47

passed #107041
test

00:00:39

 
  Manual
manual #107047
allowed to fail manual
armv8
manual #107043
allowed to fail manual
flatpak
manual #107046
allowed to fail manual
msan
manual #107048
allowed to fail manual
ppc64le
manual #107044
allowed to fail manual
tsan
manual #107045
allowed to fail manual
ubsan
 
  Review
manual #107049
allowed to fail manual
review
manual #107050
allowed to fail manual
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