native: fix login button

fixes #20

native/LoginScreen.qml

@@ -71,7 +71,10 @@ Rectangle {
 
         text: qsTr("Submit")
 
-        onClicked: {
+        onClicked: login
+    }
+
+    function login() {
         var xhr = new XMLHttpRequest();
         xhr.open("POST", "https://api.clan-war.net/api/v1/auth/login");
         xhr.setRequestHeader("Content-Type", "application/json");
@@ -92,4 +95,3 @@ Rectangle {
         xhr.send(data);
     }
 }
-}

native/Main.qml

@@ -31,9 +31,9 @@ Window {
     Component {
         id: loginPageComponent
         LoginScreen {
-            onLoginSuccess: {
-                authToken = token
-                stackView.push(mainPageComponent)
+            onLoginSuccess: function(token) {
+                authToken = token;
+                stackView.push(mainPageComponent);
             }
         }
     }