index.html.in: finish the QR focus toggle

index.html.in: finish the QR focus toggle

Get the QR focus toggle working "completely."

  * Don't show ticket resize transitions when the page loads
    (Commuter bus / MARC).
  * Fade out the origin/destination and zone when the QR is
    focused (Commuter bus / MARC).
  * Resize the bottom portion of the ticket when the QR code
    is focused, so that the QR sits in the "middle" like it
    does on CharmPass.
  * Don't recompute dimensions if we're going to toggle the
    QR code _off_.

BaltimoreLink tickets are essentially correct. I have yet to compare
against real Commuter bus and MARC train tickets, but the current
behavior is reasonable.