task.py; remove fill_field call for mixcr config

Now that we use airr output, we will not use this to fill the vidjil export
Link to #4164
4 jobs for feature-s/4164-add-airr-config-mixcr in 6 minutes and 33 seconds (queued for 4 seconds)
latest
Status Job ID Name Coverage
  Test Tools
passed #525134
test_tools

00:00:11

 
  Test Unit
passed #525135
web
test_server_unit

00:00:19

 
  Test Functional
passed #525136
docker x86_64
ff32-server-functional

00:04:53

passed #525137
docker x86_64
ff45-server-functional

00:05:59