refactor and cleanup analytics class

src/background.ts

@@ -1,8 +1,6 @@
 import MainBackground from './background/main.background';
 
-const bitwardenIsBackground = (window as any).bitwardenIsBackground = true;
 const bitwardenMain = (window as any).bitwardenMain = new MainBackground();
-
 bitwardenMain.bootstrap().then(() => {
     // Finished bootstrapping
 });