Improve href-sanitizer sciptlet

Tolerate unexpected spaces in extracted URL parameters.

Related feedback:
uBlockOrigin/uBlock-issues#3297 (comment)

assets/resources/scriptlets.js

@@ -3551,9 +3551,12 @@ function hrefSanitizer(
         const end = recursive ? source.indexOf('?', 1) : source.length;
         try {
             const url = new URL(href, document.location);
-            const value = url.searchParams.get(source.slice(1, end));
+            let value = url.searchParams.get(source.slice(1, end));
             if ( value === null ) { return href }
             if ( recursive ) { return extractParam(value, source.slice(end)); }
+            if ( value.includes(' ') ) {
+                value = value.replace(/ /g, '%20');
+            }
             return value;
         } catch(x) {
         }