feat: fix results JSON for Windows plugin

Author: sowens-csd

speech_to_text_windows/windows/speech_to_text_windows_plugin.cpp

@@ -331,8 +331,8 @@ void SpeechToTextWindowsPlugin::GetLocales(
 
 void SpeechToTextWindowsPlugin::SendTextRecognition(const std::string& text, bool is_final) {
   if (m_channel) {
-    std::string json_result = "{\"recognizedWords\":\"" + text + 
-                             "\",\"finalResult\":" + (is_final ? std::to_string(FINAL_RESULT) : std::to_string(PARTIAL_RESULT)) + "}";
+    std::string json_result = "{\"alternates\":[{\"recognizedWords\":\"" + text + 
+                             "\",\"confidence\":0.85}],\"finalResult\":" + (is_final ? std::to_string(FINAL_RESULT) : std::to_string(PARTIAL_RESULT)) + "}";
     std::cout << "Sending to Flutter: " << json_result << std::endl;
     m_channel->InvokeMethod("textRecognition", 
         std::make_unique<flutter::EncodableValue>(json_result));