Update SnippetHolder.java

Author: siyuniums

instrumentation/servlet/servlet-common/bootstrap/src/main/java/io/opentelemetry/javaagent/bootstrap/servlet/SnippetHolder.java

@@ -9,7 +9,7 @@
 
 public class SnippetHolder {
 
-  private static String snippet = "<script>Testing</script>";
+  private static String snippet = "";
 
   public static void setSnippet(String snippet) {
     SnippetHolder.snippet = snippet;