fix missing dollar symbol in startowt.sh (#1344)

* fix owt-run image

* fix missing dollar symbol in startowt.sh

Author: vipcxj

docker/startowt.sh

@@ -59,7 +59,7 @@ if [ ! -z "${hostname}" ];then
     sed -i "/^hostname = /c \hostname = \"${hostname}\"" portal/portal.toml  
 fi
 
-if [ ! -z "${externalip}" ] && [ ! -z "{network_interface}" ];then
+if [ ! -z "${externalip}" ] && [ ! -z "${network_interface}" ];then
     echo ${externalip}
     sed -i "/^network_interfaces =/c \network_interfaces = [{name = \"${networkinterface}\", replaced_ip_address = \"${externalip}\"}]" webrtc_agent/agent.toml
     sed -i "/^ip_address = /c \ip_address =  \"${externalip}\"" portal/portal.toml