#71 Cancel button on sealed

[noneof yourbiz]

2 things need done with the sealed dialog. 1) It needs
a cancel button, instead of forcing you to make a deck
before you can close it. and 2) Whatever $^%$ing hotkey
auto-accepts the stupid thing desperately needs to be
disabled.
I was in the middle of typing in the chat field, the
other player initaited a sealed, then some letter I hit
auto-accepted the blasted thing. I didn't want sealed,
would have said "no" if I had gotten the prompt, and
then couldn't even just close out of the sealed
generator. (What's the point in that window having the
"X" at the top anyway? It doesn't work.)