TMDM-7638 : "NPE happen When import a trigger from server"

Use "int" instead of "Integer" to prevent null in executeOrder variable (not needed since null values were considered as 0).
Fixes issues in WS <-> Pojo conversion: was not taking in account "deactive" field value / was not taking in account "executeOrder" field value.
(https://jira.talendforge.org/browse/TMDM-7638)