Multiple notifications fixes (#2154)

* Dont reset notifications feed on push notification event

* Dont separate notifications by read state to avoid jank

* On notifications screen focus, check latest and only rerender if not scrolled down

* Reuse the cached notifs page when its not stale

* Bump ios build number

* Improve comments

* Change the 'mark all read' condition to avoid firing too early

app.config.js

@@ -9,7 +9,7 @@ module.exports = function () {
   /**
    * iOS build number. Must be incremented for each TestFlight version.
    */
-  const IOS_BUILD_NUMBER = '12'
+  const IOS_BUILD_NUMBER = '13'
 
   /**
    * Android build number. Must be incremented for each release.