Merge #1980

1980: fix freshclam startup r=mergify[bot] a=ghostwheel42

## What type of PR?

bug-fix

## What does this PR do?

make freshclam start and run
- create pid file in existing folder /run
- let freshclam log to stdout
- remove deprecated SafeBrowsing

### Related issue(s)

closes #1632 

## Prerequisites
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

- [X] In case of feature or enhancement: documentation updated accordingly
- [X] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file.


Co-authored-by: Alexander Graf <ghostwheel42@users.noreply.github.com>

optional/clamav/conf/freshclam.conf

@@ -3,9 +3,9 @@
 ###############
 
 DatabaseDirectory /data
-LogSyslog yes
+UpdateLogFile /dev/stdout
 LogTime yes
-PidFile /run/clamav/freshclam.pid
+PidFile /run/freshclam.pid
 DatabaseOwner root
 
 ###############
@@ -15,5 +15,4 @@ DatabaseOwner root
 DatabaseMirror database.clamav.net
 ScriptedUpdates yes
 NotifyClamd /etc/clamav/clamd.conf
-SafeBrowsing yes
 Bytecode yes