compiler-cranelift: Fix typo in enum variant

[epilys]

Small typo prevented wasm32 target from being built.

error[E0599]: no variant or associated item named `FDE` found for enum `CraneliftUnwindInfo` in the current scope
   --> lib/compiler-cranelift/src/compiler.rs:171:42
    |
171 |                     CraneliftUnwindInfo::FDE(fde) => {
    |                                          ^^^
    |                                          |
    |                                          variant or associated item not found in `CraneliftUnwindInfo`
    |                                          help: there is a variant with a similar name: `Fde`
    |
   ::: lib/compiler-cranelift/src/translator/unwind.rs:11:1
    |
11  | pub(crate) enum CraneliftUnwindInfo {
    | ----------------------------------- variant or associated item `FDE` not found here

[epilys]

bors r+

[epilys]

bors r-

[bors]

Canceled.

[epilys]

bors r+

[bors]

Build succeeded:

• Code lint