flatpak: Only ignore estimated progress if >10%

Flatpak may set the "estimating" flag on a progress report if the value
is bogus, or it may set it if it is downloading metadata which it
arbitrarily decides comprises the first 5% of an install operation.
Ignoring estimated progress therefore means we get no progress changes
for the first 10% of an app install (installing the app and its locale
extension). Instead, only ignore the estimated progress if it is an
obviously bogus value of >10%.
2 jobs for allow-estimated-progress in 4 minutes and 16 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #518315
debian-stable-x86_64

00:02:25

passed #518314
fedora-x86_64

00:04:16