Manipulation: increase delay of data-URI test

For Safar7/Opera - shot in the dark, can't reproduce this locally

Fixes gh-1993
(cherry-picked from 30ace26c42)

test/unit/manipulation.js

@@ -2474,5 +2474,5 @@ asyncTest( "Insert script with data-URI (gh-1887)", 1, function() {
 		}
 
 		start();
-	});
+	}, 100 );
 });