remove bottom: 0 to prevent the menu form overlapping the whole element. This happens if a folder has entries, the menu expands to the very bottom and overlaps all entries and makes them impossible to click

fix input width which was changed likely with the icon PR

use calc because firefox and chrome have different scrollbar widths which causes firefox to push the button into the next row while everything is well in chrome

add normal width for IE8
add some minor fixes for IE8
Merge pull request #11040 from owncloud/fix-app-menu-overlapp

Remove bottom: 0 from app-navigation-entry-utils to prevent the utils form overlapping the whole element....