Bug 1789419 - Remove credit card test that depends on build setting. r=sgalich

The test fails on beta simulation because release build and late beta
use a higher confidence threshold.

We can remvoe this test since the test is already covered by the next
two testcases (low confidence & high confidence)

Differential Revision: https://phabricator.services.mozilla.com/D156571

browser/extensions/formautofill/test/browser/creditCard/browser_creditCard_heuristics.js

@@ -32,14 +32,8 @@ const TESTCASES = [
     idsToShowPopup: ["cc-number"],
   },
   {
-    description: "one input field cc-number without autocomplete",
-    document: `<form>
-                <input id="cc-number" name="credit card number">
-               </form>`,
-    idsToShowPopup: ["cc-number"],
-  },
-  {
-    description: "one input field cc-number high confidence",
+    description:
+      "one input field cc-number without autocomplete (high confidence)",
     document: `<form>
                 <input id="cc-number" name="credit card number">
                </form>`,
@@ -53,7 +47,8 @@ const TESTCASES = [
     idsToShowPopup: ["cc-number"],
   },
   {
-    description: "one input field cc-number low confidence",
+    description:
+      "one input field cc-number without autocomplete (low confidence)",
     document: `<form>
                 <input id="cc-number" name="credit card number">
                </form>`,