script: Finish converting all error message enum variants to Option<String> (#40750)

I used find and replace to finish the job. All this PR does is replace
all `Error::<error_name>` occurrences with `Error::<error_name>(None)`.

Testing: Refactor
Fixes: #39053

Signed-off-by: Ashwin Naren <arihant2math@gmail.com>

components/script/dom/css/css.rs

@@ -109,7 +109,7 @@ impl CSSMethods<crate::DomTypeHolder> for CSS {
                 RegisterPropertyError::InitialValueNotComputationallyIndependent => {
                     Error::Syntax(None)
                 },
-                RegisterPropertyError::AlreadyRegistered => Error::InvalidModification,
+                RegisterPropertyError::AlreadyRegistered => Error::InvalidModification(None),
             })?;
 
         Ok(())