remove duplicate entry

Author: marwan-hallaoui

src/java.base/share/lib/security/default.policy

@@ -167,10 +167,6 @@ grant codeBase "jrt:/jdk.graal.compiler" {
     permission java.security.AllPermission;
 };
 
-grant codeBase "jrt:/jdk.graal.compiler" {
-    permission java.security.AllPermission;
-};
-
 grant codeBase "jrt:/jdk.jsobject" {
     permission java.security.AllPermission;
 };