🔥 remove false positive trigger of 2015-9251 in test

before this change, reproducing 2020-7656 would cause the test site to show that 2015-9251 was triggered when it was not

Author: ctcpip

security/site/xss.html

@@ -1,21 +1,17 @@
 <script>
-	triggerCVE('2015-9251');
 	triggerCVE('2020-7656');
 </script >
 
 <script>
-	triggerCVE('2015-9251');
 	triggerCVE('2020-7656');
 </script
 >
 
 <script>
-	triggerCVE('2015-9251');
 	triggerCVE('2020-7656');
 </script    >
 
 <script>
-	triggerCVE('2015-9251');
 	triggerCVE('2020-7656');
 </script