main/fail2ban: fix process name

Bring in upstream revert of the process name change that broke Nagios
monitioring plugins etc.

Change process name from f2b/server back to fail2ban-server
8 jobs for !9758 with fail2ban-fix-procname in 7 minutes and 21 seconds
detached
Status Job ID Name Coverage
  Lint
passed #155627
docker-alpine x86_64
lint

00:00:28

 
  Build
passed #155632
docker-alpine ci-build aarch64
build-aarch64

00:02:45

passed #155634
armv7 ci-build docker-alpine
build-armv7

00:02:49

passed #155631
docker-alpine ci-build ppc64le
build-ppc64le

00:04:01

passed #155630
docker-alpine ci-build s390x
build-s390x

00:00:25

passed #155629
docker-alpine ci-build x86
build-x86

00:02:29

passed #155628
docker-alpine ci-build x86_64
build-x86_64

00:02:12

canceled #155633
docker-alpine ci-build armv7
build-armv7

00:31:16