Do not show dialog if correct port

app/src/main/java/org/traccar/client/MainActivity.java

@@ -134,11 +134,13 @@ public class MainActivity extends PreferenceActivity implements OnSharedPreferen
         String KEY_SHOWN_PORT_DIALOG = "portDialogHasBeenShown";
 
         SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
+        if (!preferences.getString(KEY_PORT, "5055").equals("5055")) {
             if (!firstLaunch) {
                 if (!preferences.contains(KEY_SHOWN_PORT_DIALOG)) {
                     showDialog(0);
                 }
             }
+        }
 
         preferences.edit().putBoolean(KEY_SHOWN_PORT_DIALOG, true).commit();
     }