fix unsued variable error on ios

warning: unused variable: `origin`
    --> /Users/jenkins/jenkins/workspace/pr-brave-browser-combine-rust-libs-ios/src/brave/components/speedreader/rust/lib/src/rewriter_config_builder.rs:40:5
     |
  40 |     origin: &str,
     |     ^^^^^^ help: consider prefixing with an underscore: `_origin`
     |
     = note: `#[warn(unused_variables)]` on by default
  
     Compiling speedreader-ffi v0.1.0 (/Users/jenkins/jenkins/workspace/pr-brave-browser-combine-rust-libs-ios/src/brave/components/speedreader/rust/ffi)
     Compiling adblock-ffi v0.1.0 (/Users/jenkins/jenkins/workspace/pr-brave-browser-combine-rust-libs-ios/src/brave/vendor/adblock_rust_ffi)

build/rust/Cargo.lock

@@ -232,7 +232,7 @@ dependencies = [
 
 [[package]]
 name = "challenge-bypass-ristretto-ffi"
-version = "1.0.0-pre.1"
+version = "1.0.0-pre.2"
 dependencies = [
  "base64 0.9.3",
  "challenge-bypass-ristretto",

components/speedreader/rust/lib/src/rewriter_config_builder.rs

@@ -37,7 +37,7 @@ impl From<TextHandler> for ContentFunction {
 
 pub fn rewrite_rules_to_content_handlers(
     conf: &RewriteRules,
-    origin: &str,
+    _origin: &str,
 ) -> Vec<(Selector, ContentFunction)> {
     let mut element_content_handlers = vec![];
     let mut errors = vec![];