Tests: Remove Edge version from the user agent

The version will change in the future, matching by /edge\//i is enough

(cherry-picked from 5a1217e40193c8884155ccaf415091d326ddb52a)

Refs 8e111df641cca3e1b75b31a1971bfc89014b4ded

test/unit/support.js

@@ -68,7 +68,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 	var expected,
 		userAgent = window.navigator.userAgent;
 
-	if ( /edge\/12/i.test( userAgent ) ) {
+	if ( /edge\//i.test( userAgent ) ) {
 		expected = {
 			"ajax": true,
 			"attributes": true,