Fix session payload for W3C

Author: SrinivasanTarget

src/main/java/io/appium/java_client/remote/NewAppiumSessionPayload.java

@@ -268,7 +268,7 @@ public void writeTo(Appendable appendable) throws IOException {
  json.name(CAPABILITIES);
  json.beginObject();
 
- json.name(DESIRED_CAPABILITIES);
+ json.name(ALWAYS_MATCH);
  json.write(first);
 
  // Then write everything into the w3c payload. Because of the way we do this, it's easiest