[EH] Fix delegating to caller when func result is concrete (#6518)

hen the function return type is concrete, the translation result of a
`try`-`delegate` that targets the caller includes a `return` that
returns the whole function body:
https://github.com/WebAssembly/binaryen/blob/219e668e87b012c0634043ed702534b8be31231f/src/passes/TranslateEH.cpp#L751-L763

We should do that based on the function's return type, not the function
body's return type. The previous code didn't handle the case where the
function's return type is concrete but the function body's return type
is unreachable.

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