dist: goreleaser, remove empty_folders directive

This is not needed and in Centos it overwrites already existing directory with wrong user and permissions.

The below snippet from rpm installation debug logs happens after the preinstall scriplet.

```
D: create     040755  1 (   0,   0)     0 /var/lib/scylla-manager
```

It does not affect Ubuntu.

Fixes #3032

dist/.goreleaser.yaml

@@ -91,8 +91,6 @@ nfpms:
       - rpm
     bindir: /usr/bin
 
-    empty_folders:
-      - /var/lib/scylla-manager
     contents:
       - src: etc/scylla-manager.yaml
         dst: /etc/scylla-manager/scylla-manager.yaml
@@ -186,8 +184,6 @@ nfpms:
       - rpm
     bindir: /usr/bin
 
-    empty_folders:
-      - /var/lib/scylla-manager
     contents:
       - src: etc/scylla-manager-agent.yaml
         dst: /etc/scylla-manager-agent/scylla-manager-agent.yaml