Update TC13.2-1.c-fail-3 - aria and html heading level conflicts

[drewnielson]

Change to Baseline and to test case TC13.2-1.c-fail-3; change this test case to a pass; in case of conflict between native/implied role and explicit role, user agent should default to native role: https://www.w3.org/TR/wai-aria-1.1/#host_general_conflict

[kengdoj]

Aria takes precedence over the heading level set by HTML <h>

w3c/html-aria#454 (comment)

There is no native 'level' attribute for heading elements where it would take precedent over the aria-level attribute. the level is implicit based on the tag name