Bug 1570502 - Fixed typo erroCodeString to errorCodeString r=keeler

Fix for Bug: 1570502
fixed typo `erroCodeString` to `errorCodeStrng`

Differential Revision: https://phabricator.services.mozilla.com/D52492

browser/base/content/aboutNetError.js

@@ -817,7 +817,7 @@ async function setCertErrorDetails(event) {
     // Also don't bother if it's just the user's clock being off...
     !clockSkew &&
     // Symantec distrust is likely harmless as well.
-    failedCertInfo.erroCodeString !=
+    failedCertInfo.errorCodeString !=
       "MOZILLA_PKIX_ERROR_ADDITIONAL_POLICY_CONSTRAINT_FAILED"
   ) {
     document.body.classList.add("caution");