clippy fix

[steph-rs]

Solve clippy warnings correctly: (now I used prefix _ for these varibales)
error: parameter is only used in recursion

error: parameter is only used in recursion
   --> translator/eth/src/bytecode/hir/ir.rs:150:27
    |
150 |     pub fn resolve(&self, ir: &Hir, ctx: &Context) -> Option<U256> {
    |                           ^^ help: if this is intentional, prefix it with an underscore: `_ir`
    |
    = note: `-D clippy::only-used-in-recursion` implied by `-D warnings`
note: parameter used here
   --> translator/eth/src/bytecode/hir/ir.rs:155:30
    |
155 |                 expr.resolve(ir, ctx)
    |                              ^^
...
164 |                 let arg = arg.resolve(ir, ctx)?;
    |                                       ^^
...
168 |                 let arg1 = arg1.resolve(ir, ctx)?;
    |                                         ^^
169 |                 let arg2 = arg2.resolve(ir, ctx)?;
    |                                         ^^
...
173 |                 let arg1 = arg1.resolve(ir, ctx)?;
    |                                         ^^
174 |                 let arg2 = arg2.resolve(ir, ctx)?;
    |                                         ^^
175 |                 let arg3 = arg3.resolve(ir, ctx)?;
    |                                         ^^
...
179 |             _Expr::Copy(expr) => expr.resolve(ir, ctx),
    |                                               ^^
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#only_used_in_recursion

error: parameter is only used in recursion
   --> translator/mv/src/mv_ir/crop.rs:549:5
    |
549 |     last_handle_index: Option<StructHandleIndex>,
    |     ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_last_handle_index`
    |
    = note: `-D clippy::only-used-in-recursion` implied by `-D warnings`
note: parameter used here
   --> translator/mv/src/mv_ir/crop.rs:575:62
    |
575 |             change_signature(sign, handle_index_transaction, last_handle_index)
    |                                                              ^^^^^^^^^^^^^^^^^
...
579 |             change_signature(sign, handle_index_transaction, last_handle_index)
    |                                                              ^^^^^^^^^^^^^^^^^
...
583 |             change_signature(sign, handle_index_transaction, last_handle_index)
    |                                                              ^^^^^^^^^^^^^^^^^
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#only_used_in_recursion