index.js: fix wording in android popup

src/vector/index.js

@@ -207,7 +207,7 @@ async function loadApp() {
         }
     }
     else if (/Android/.test(navigator.userAgent)) {
-        if (confirm("Vector runs much better as an app on Vector. Get the app?")) {
+        if (confirm("Vector runs much better as an app on Android. Get the app?")) {
             window.location = "https://play.google.com/store/apps/details?id=im.vector.alpha";
             return;
         }