fix(mod_geoip.sls): fix `salt-lint` errors

```bash
Examining apache/mod_geoip.sls of type state
[201] Trailing whitespace
apache/mod_geoip.sls:30
    - source:
```

apache/mod_geoip.sls

@@ -27,7 +27,7 @@ geoip conf:
     - user: root
     - group: root
     - mode: 644
-    - source: 
+    - source:
       - salt://apache/files/{{ salt['grains.get']('os_family') }}/geoip.conf
 
 geoip database: