Android fixes (#515)

* Fix profile screen performance on android and remove dead code

* Correctly handle android hardware back btn

* Fix EditProfile modal for android

* Fix lint

src/App.native.tsx

@@ -13,6 +13,7 @@ import {RootStoreModel, setupState, RootStoreProvider} from './state'
 import {Shell} from './view/shell'
 import * as notifee from 'lib/notifee'
 import * as analytics from 'lib/analytics'
+import * as backHandler from 'lib/routes/back-handler'
 import * as Toast from './view/com/util/Toast'
 import {handleLink} from './Navigation'
 
@@ -28,6 +29,7 @@ const App = observer(() => {
       setRootStore(store)
       analytics.init(store)
       notifee.init(store)
+      backHandler.init(store)
       SplashScreen.hideAsync()
       Linking.getInitialURL().then((url: string | null) => {
         if (url) {