Update viewport height

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

@@ -1118,6 +1118,11 @@ public class ApplicationEx extends Application
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && !BuildConfig.DEBUG)
             editor.remove("background_service");
 
+        if (version < 2298) {
+            if (prefs.contains("viewport_height"))
+                editor.putInt("viewport_height", 0);
+        }
+
         if (version < BuildConfig.VERSION_CODE)
             editor.putInt("previous_version", version);
         editor.putInt("version", BuildConfig.VERSION_CODE);