Update strings.xml

updating demo server, demos.kaazing.com

Author: Michael Cretzman

android/ws/app/src/main/res/values/strings.xml

@@ -5,7 +5,7 @@
     <string name="password_hint">Password</string>
     <string name="ok_label">OK</string>
     <string name="cancel_label">Cancel</string>
-    <string name="location_default">wss://sandbox.kaazing.net/echo</string>
+    <string name="location_default">wss://demos.kaazing.com/echo</string>
     <string name="disconnect_label">Disconnect</string>
     <string name="connect_label">Connect</string>
     <string name="message_default">Hello World!</string>