restored zabbix config file to default

zabbix/zabbix_server.conf

 # Mandatory: no
 # Range: 1024-32767
 # Default:
-# ListenPort=10051
+ListenPort=ZABBIX_PORT
 
 ### Option: SourceIP
 #	Source IP address for outgoing connections.
 # Mandatory: no
 # Range: 0-1000
 # Default:
-# StartPollers=1
+StartPollers=20
 
 ### Option: StartIPMIPollers
 #	Number of pre-forked instances of IPMI pollers.
 # Mandatory: no
 # Range: 0-250
 # Default:
-StartProxyPollers=20
+# StartProxyPollers=1
 
 ### Option: ProxyConfigFrequency
 #	How often Zabbix Server sends configuration data to a Zabbix Proxy in seconds.