Clicking on browse button should close the browse drawer

In mobile browsers, both Chrome and Safari, tapping on the browse button does not immediately close the browse menu, it must be tapped twice.

Steps to reproduce:

• Log into nightly.nuxeo.com from a mobile browser (Chrome or Safari).
• Tap on the browse button.
• Navigate through the browse tree to a folder.
• Tap on the browse button once.
  => Browse tooltip appears, but browse drawer doesn't open.
• Tap on the browse button again.
  => Browse drawer closes.