Bug 1771740 - Do not call `removeAllRecords` in setStorage r=sgalich

In Bug 1762070, we added `setStorage` to replace `saveAddress` and
`saveCreditCard`. However, adding `removeAllRecords` in `setStorage`
changes the flow for testcases that don't expect `saveAddress/CreditCard`
removing previous saved records.

Differential Revision: https://phabricator.services.mozilla.com/D147658

browser/extensions/formautofill/test/browser/head.js

@@ -770,7 +770,6 @@ async function testDialog(url, testFn, arg = undefined) {
  * @param {...Object} items Can either be credit card or address objects
  */
 async function setStorage(...items) {
-  await removeAllRecords();
   for (let item of items) {
     if (item["cc-number"]) {
       await saveCreditCard(item);