Two small PolyGerrit fixes

+ Specify whitespace parameter when fetching a diff.
+ Pass the correct var to Promise.all within gr-date-formatter_test.html

Change-Id: Ife49a67639891adae7d99e735516b86e54132724

polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_test.html

@@ -125,7 +125,7 @@ limitations under the License.
         getLoggedIn: sinon.stub().returns(loggedInPromise),
         getPreferences: sinon.stub().returns(preferencesPromise),
       });
-      return Promise.all([loggedInPromise, preferences]);
+      return Promise.all([loggedInPromise, preferencesPromise]);
     }
 
     suite('logged in', function() {

polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js

@@ -176,7 +176,8 @@
       var url = this._getDiffFetchURL(changeNum, patchNum, path);
       var params =  {
         context: 'ALL',
-        intraline: null
+        intraline: null,
+        whitespace: 'IGNORE_NONE',
       };
       if (basePatchNum != PARENT_PATCH_NUM) {
         params.base = basePatchNum;