[statistics][templates] Simplify user usage

No reason to access the request that many time
when the user can be put directly in the context
used to render the template
1 job for 514_fix_front_page_stats in 15 minutes and 7 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #209786
docker-build
build_linux_36

00:15:07

69.0%