Add failing test for autocomplete with dynamic type

This will cause axe to throw an error like:

> TypeError: Cannot read property 'replace' of null

I believe that the problem might be related to getLiteralPropValue
returning `null` instead of `undefined` for dynamic props.

Author: lencioni

__tests__/src/rules/autocomplete-valid-test.js

@@ -54,6 +54,7 @@ ruleTester.run('autocomplete-valid', rule, {
     { code: '<input type="text" autocomplete="invalid name" />;', errors: invalidAutocomplete },
     { code: '<input type="text" autocomplete="home url" />;', errors: invalidAutocomplete },
     { code: '<Bar autocomplete="baz"></Bar>;', errors: invalidAutocomplete, options: [{ inputComponents: ['Bar'] }] },
+    { code: '<input type={isEmail ? "email" : "text"} autocomplete="none" />;', errors: invalidAutocomplete },
 
     // FAILED "autocomplete-appropriate"
     { code: '<input type="date" autocomplete="email" />;', errors: inappropriateAutocomplete },