remove unused variables.

src/EyesAndEars.UWP/EyesAndEars.UWP/MainPage.xaml.cs

@@ -12,7 +12,6 @@ namespace EyesAndEars.UWP {
 
         MainPageVM _vm = new MainPageVM();
         DispatcherTimer _dispatcherTimer = new DispatcherTimer();
-        string _baseURL = "http://3.9.19.84";
 
         public MainPage() {
             InitializeComponent();