mysql-srv: Remove unnecessary Clone

The github issue requiring that Clone be implemented for Packet has been
resolved, so this commit removes it, as it is not needed.

Change-Id: Ic0b4ad68083f32dd6bf89a2cfdd45c85bbceb2f5
Reviewed-on: https://gerrit.readyset.name/c/readyset/+/5274
Tested-by: Buildkite CI
Reviewed-by: Dan Wilbanks <dan@readyset.io>

mysql-srv/src/packet.rs

@@ -331,8 +331,6 @@ pub fn onepacket(i: &[u8]) -> nom::IResult<&[u8], (u8, &[u8])> {
     Ok((i, (seq[0], bytes)))
 }
 
-// Clone because of https://github.com/Geal/nom/issues/1008
-#[derive(Clone)]
 pub struct Packet<'a>(&'a [u8], Vec<u8>);
 
 impl<'a> Packet<'a> {