CS-16039 : Enabling/Disabling of Zone results in localstorageenabled flag to be reset to false.

Updated get method to retuen null if no value specified for localstorageenabled in UpdateZone command.
Reviewed-by: Abhi

api/src/com/cloud/api/commands/UpdateZoneCmd.java

@@ -139,9 +139,6 @@ public class UpdateZoneCmd extends BaseCmd {
     }   
 
     public Boolean getLocalStorageEnabled() {
-        if (localStorageEnabled == null) {
-            return false;
-        }
         return localStorageEnabled;
     }