remove another stray license comment

Author: drahnr

src/pyroscope.rs

@@ -7,9 +7,6 @@ use std::{
     thread::JoinHandle,
 };
 
-// Licensed under the Apache License, Version 2.0 <LICENSE or
-// https://www.apache.org/licenses/LICENSE-2.0>. This file may not be copied, modified, or distributed
-// except according to those terms.
 use crate::{
     backends::{pprof::Pprof, Backend},
     error::Result,