Auto merge of #22666 - CYBAI:urlsearchparams-no-trailing-q, r=nox

Remove trailing ? when updating URLSearchParams

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #22639
- [x] There are tests for these changes

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components/script/dom/url.rs

@@ -57,10 +57,15 @@ impl URL {
 
     pub fn set_query_pairs(&self, pairs: &[(String, String)]) {
         let mut url = self.url.borrow_mut();
-        url.as_mut_url()
-            .query_pairs_mut()
-            .clear()
-            .extend_pairs(pairs);
+
+        if pairs.is_empty() {
+            url.as_mut_url().set_query(None);
+        } else {
+            url.as_mut_url()
+                .query_pairs_mut()
+                .clear()
+                .extend_pairs(pairs);
+        }
     }
 }