Fix RequiresFeature lint: setPaymentRequestEnabled should only be called if the feature PAYMENT_REQUEST is present

Ensures the function works correctly even when called without prior WebViewFeature.isFeatureSupported check.

ref. https://developers.google.com/pay/api/android/guides/recipes/using-android-webview#enable-payment-request-api

Author: mataku

packages/webview_flutter/webview_flutter_android/android/src/main/java/io/flutter/plugins/webviewflutter/WebSettingsCompatProxyApi.java

@@ -7,6 +7,7 @@
 import android.webkit.WebSettings;
 import androidx.annotation.NonNull;
 import androidx.webkit.WebSettingsCompat;
+import androidx.webkit.WebViewFeature;
 
 /**
  * Host api implementation for {@link WebSettingsCompat}.
@@ -20,6 +21,8 @@ public WebSettingsCompatProxyApi(@NonNull ProxyApiRegistrar pigeonRegistrar) {
 
   @Override
   public void setPaymentRequestEnabled(@NonNull WebSettings webSettings, boolean enabled) {
-    WebSettingsCompat.setPaymentRequestEnabled(webSettings, enabled);
+    if (WebViewFeature.isFeatureSupported(WebViewFeature.PAYMENT_REQUEST)) {
+      WebSettingsCompat.setPaymentRequestEnabled(webSettings, enabled);
+    }
   }
 }