Fixed wrong templating for source and exclude directories

templates/opt/simple-backup/simple-backup.conf.j2

@@ -5,8 +5,8 @@ volume={{ simple_backup_config.nfs_volume_path }}
 
 [files]
 {% for item in simple_backup_config.sources %}
-    nfs={{ item }}
+source={{ item }}
 {% endfor %}
 {% for item in simple_backup_config.excludes %}
-    exclude={{ item }}
+exclude={{ item }}
 {% endfor %}