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 8 minutes and 36 seconds
detached
Status Job ID Name Coverage
  Lint
passed #154344
x86_64 docker-alpine
lint

00:00:25

 
  Build
passed #154349
aarch64 ci-build docker-alpine
build-aarch64

00:03:01

passed #154380
docker-alpine ci-build armv7
build-armv7

00:03:05

passed #154348
ppc64le ci-build docker-alpine
build-ppc64le

00:05:04

passed #154347
s390x ci-build docker-alpine
build-s390x

00:00:19

passed #154346
x86 ci-build docker-alpine
build-x86

00:02:47

passed #154345
x86_64 ci-build docker-alpine
build-x86_64

00:01:50

failed #154350
armv7 ci-build docker-alpine
build-armv7

01:00:00