fix build-id-hotfix typo

Author: lkasso

lib/metawear.js

@@ -321,7 +321,7 @@ MetaWear.prototype.updateFirmwareToRevAndFlavor = function (rev, flavor, callbac
         sanitaizedCallback(error);
         return;
       }
-      var currentFlavor = MetaWear.mbl_mw_settings_get_firware_build_id(this.board).toString();
+      var currentFlavor = MetaWear.mbl_mw_settings_get_firmware_build_id(this.board).toString();
       if ((firmwareRev === rev) && (currentFlavor === flavor)) {
         sanitaizedCallback(null);
         return;