fix(demo): revert interceptor trimEnd change, normalizeUrl alone fixes consistency

The trailing slash normalization in normalizeUrl is sufficient to ensure
consistent behavior between manual URL entry and button clicks.
The interceptor should keep matching exact URLs without trailing slash.

Author: kdroidFilter

demo-shared/src/commonMain/kotlin/io/github/kdroidfilter/webview/demo/DemoRequestInterceptor.kt

@@ -21,7 +21,7 @@ internal class DemoRequestInterceptor(
             return WebRequestInterceptResult.Reject
         }
 
-        if (url.trimEnd('/') == "https://example.com" || url.trimEnd('/') == "https://www.example.com") {
+        if (url == "https://example.com" || url == "https://www.example.com") {
             val rewritten = "https://httpbin.org/anything?from=interceptor&original=" + uriEncodeComponent(url)
             onLog("interceptor: rewrite $url -> $rewritten")
             val modified =