Fix issue with reconfiguring policy

The cause of the issue is not passing the newly introduced parameter 'policyType' in the policy edit payload. This parameter is marked @NotNull. Hence throwing an error. 

This fix sets the policyType parameter from the existing payload (Doesn't allow to edit as there is no UI interface to edit this parameter ATM

Fixes: entgra/product-iots#175

components/device-mgt/org.wso2.carbon.device.mgt.ui/src/main/resources/jaggeryapps/devicemgt/app/units/cdmf.unit.policy.edit/public/js/policy-edit.js

@@ -148,6 +148,7 @@ $("#policy-name-input").focus(function () {
 skipStep["policy-platform"] = function (policyPayloadObj) {
     policy["name"] = policyPayloadObj["policyName"];
     policy["platform"] = policyPayloadObj["profile"]["deviceType"];
+    policy["policyType"] = policyPayloadObj["policyType"];
 
     var userRoleInput = $("#user-roles-input");
     var ownershipInput = $("#ownership-input");
@@ -488,6 +489,7 @@ var updatePolicy = function (policy, state) {
     var payload = {
         "policyName": policy["policyName"],
         "description": policy["description"],
+        "policyType": policy["policyType"],
         "compliance": policy["selectedNonCompliantAction"],
         "ownershipType": null,
         "profile": {