Androidclosefix

Debounces the menu from immediately closing on android browsers by introducing a delay.

This is a cleaned up branch based on the following PR https://github.com/ivaynberg/select2/pull/2644
This was removed in https://github.com/Soviut/select2/commit/127221a628740dda0726a4b343cccc683e51a9fc, can you remove this commit from the pull request?

The issue that prompted it should have been fixed on the master.