fix(input): remove workaround for Firefox bug

The bug in question has been fixed in FF 38, which is also the
current ESR, so it's safe to remove the workaround: https://bugzilla.mozilla.org/show_bug.cgi?id=1064430

Author: Narretz

src/ng/directive/input.js

@@ -1337,11 +1337,7 @@ function badInputChecker(scope, element, attr, ctrl) {
   if (nativeValidation) {
     ctrl.$parsers.push(function(value) {
       var validity = element.prop(VALIDITY_STATE_PROPERTY) || {};
-      // Detect bug in FF35 for input[email] (https://bugzilla.mozilla.org/show_bug.cgi?id=1064430):
-      // - also sets validity.badInput (should only be validity.typeMismatch).
-      // - see http://www.whatwg.org/specs/web-apps/current-work/multipage/forms.html#e-mail-state-(type=email)
-      // - can ignore this case as we can still read out the erroneous email...
-      return validity.badInput && !validity.typeMismatch ? undefined : value;
+      return validity.badInput || validity.typeMismatch ? undefined : value;
     });
   }
 }