Support viewport meta tag

app/src/main/java/eu/faircode/email/FragmentWebView.java

@@ -52,6 +52,7 @@ public class FragmentWebView extends FragmentEx {
 
         WebSettings settings = webview.getSettings();
         settings.setJavaScriptEnabled(true);
+        settings.setUseWideViewPort(true);
         settings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
 
         final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());