cloud_server: change default apn to plgd

plgd-dev/cloud changed the test apn to plgd
4 jobs for feature/add-collection-to-cloud-server in 3 minutes and 28 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #4530
Android_build

00:03:04

passed #4531
doxygen

00:01:04

passed #4528
Linux_Secured_Test

00:03:28

passed #4529
Linux_Unsecured_Test

00:03:05