Evaluate modifier keys before the regular keys, so that if a modifier
key is pressed at the same time as a regular key, that means key with
modifier is output. Some automated USB keyboards like Yubikeys need this.

This fixes a regression issue after r357861.

Reported by: Adam McDougall <mcdouga9@egr.msu.edu>
PR: 224592
PR: 233884
MFC after: 3 days
Sponsored by: Mellanox Technologies