[Updater > Module] Further minor source cleanup

src/splash/index.js

@@ -243,7 +243,6 @@ const initModuleUpdater = () => { // "Old" (not v2 / new, win32 only)
     if (!succeeded) {
       handleFail();
     } else if (updateCount === 0) {
-      moduleUpdater.setInBackground();
       launchMainWindow();
     }
   });

src/updater/moduleUpdater.js

@@ -19,7 +19,6 @@ let settings,
   basePath, manifestPath, downloadPath, bootstrapPath,
   hostUpdater,
   baseUrl, baseQuery,
-  inBackground,
   checking, hostAvail, lastUpdate;
 
 const resetTracking = () => {
@@ -360,8 +359,6 @@ exports.checkForUpdates = () => {
   }
 };
 
-exports.setInBackground = () => inBackground = true;
-
 exports.quitAndInstallUpdates = () => {
   log('Modules', 'Relaunching');