remove deref_mut()

https://github.com/raydium-io/raydium-clmm/blob/master/programs/amm/src/util/account_load.rs#L107

`
bytemuck::from_bytes_mut(&mut data.deref_mut()[8..mem::size_of::<T>() + 8])
`

The call to deref_mut() can be removed.

`
bytemuck::from_bytes_mut(&mut data[8..mem::size_of::<T>() + 8])
`

Refer to the code on line 124.

`
bytemuck::from_bytes(&data[8..mem::size_of::<T>() + 8])
`
