Mobile buttons are only clickable when scrolled to the top. Close #3847

https://github.com/diaspora/diaspora/issues/3847

Problem:
>  I can't click the buttons after scrolling. Buttons only fires any action when the user is at the top of the page.

![](https://f.cloud.github.com/assets/1857707/141624/e9111584-7256-11e2-8aea-a6b72e4ccb75.png)
*image via issue*

This problem affects Chrome but not Firefox.

With last Chrome version 26.0.1410.58 and this pull resquest works fine.