fix ota abort/invalid switching

rust/src/webserver/ota.rs

@@ -30,9 +30,6 @@ where
         Method::Post => {
             let mut offset = 0_usize;
             let mut chunk = 0;
-
-            // Erase only a single 4K block right before writing into it.
-            // The first block will be erased when offset == 0 below.
             loop {
                 let buf = read_up_to_bytes_from_request(conn, Some(4096)).await?;
                 if buf.len() == 0 {