Fix events on press "Spacebar" and "Enter"

Issue only not multiple select when select open and focused button (not "dropdown-menu *")
1. When pressed "Spacebar" select reopened instead of closing.
2. When pressed "Enter" select does not close.

I remove toggleClass('open') because this not needed, "open" class correctly toggled.
Multiple select correct work befor and after fix.

I Tested: on Linux - Firefox and Opera, Chromium, on OS X - Chrome, Safari.
Issue only in Chromium, Chrome and Safari.