c_run_key_action(): Correctly send action string to C

Using `.as_ptr()` on the `CString` didn't work. The C code wouldn't
print anything.

Turns out I needed to use `.into_raw()` in order to:

> [Consume] the CString and [transfer] ownership of the string to a C
> caller.

(https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_raw)

This allows us to correctly access and print the string in our C code.

Note that we'll still need to free the string using a new Rust function
that should be callable from C, otherwise we'll end up with a memory
leak.

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