Load SENSOR_CONFIG before showing OSD UI

SENSOR_CONFIG is used for OSD_AIR_SPEED detection

tabs/osd.js

@@ -1204,8 +1204,12 @@ TABS.osd.initialize = function (callback) {
             }
         });
 
+        // Update SENSOR_CONFIG, used to detect
+        // OSD_AIR_SPEED
+        mspHelper.loadSensorConfig(function () {
             GUI.content_ready(callback);
         });
+    });
 };
 
 TABS.osd.cleanup = function (callback) {