web_browser: Only delete temporary directory if it was created

Prevents crashes with ShopN applet occasionally.

src/core/hle/service/am/applets/web_browser.cpp

@@ -285,8 +285,10 @@ void WebBrowser::Finalize() {
     broker.PushNormalDataFromApplet(IStorage{data});
     broker.SignalStateChanged();
 
+    if (!temporary_dir.empty() && FileUtil::IsDirectory(temporary_dir)) {
         FileUtil::DeleteDirRecursively(temporary_dir);
     }
+}
 
 void WebBrowser::InitializeInternal() {
     using WebAppletInitializer = void (WebBrowser::*)();