chore: remove duplicate PCSTR (#897)

src/platform_impl/windows/util.rs

@@ -257,7 +257,6 @@ impl CursorIcon {
 pub(super) fn get_function_impl(library: &str, function: &str) -> FARPROC {
   let library = encode_wide(library);
   assert_eq!(function.chars().last(), Some('\0'));
-  let function = PCSTR::from_raw(function.as_ptr());
 
   // Library names we will use are ASCII so we can use the A version to avoid string conversion.
   let module = unsafe { LoadLibraryW(PCWSTR::from_raw(library.as_ptr())) }.unwrap_or_default();