Fix constructed idents to inherit span from original Ident

The code added to strip raw idents is unnecessary as the macro does
that for you if you read the docs and learn that you should be
passing the Ident, not a string-converted version of the Ident.

binrw_derive/src/binrw/codegen/sanitization.rs

@@ -72,7 +72,5 @@ ident_str! {
 }
 
 pub(crate) fn make_ident(ident: &Ident, kind: &str) -> Ident {
-    let ident_string = ident.to_string();
-    let ident_string = ident_string.strip_prefix("r#").unwrap_or(&ident_string);
-    format_ident!("__binrw_generated_{}_{}", kind, ident_string)
+    format_ident!("__binrw_generated_{}_{}", kind, ident)
 }