Allow door event flags for grey doors to work

[idlechild]

When I put in the door event options, I knew some of the grey doors didn't work, but it must have fallen off my radar. It wasn't that hard to make the doors work. These doors all have a flag set that stops processing in its tracks, which is a performance save (and important for certain doors). However removing that flag still causes the doors to be locked unless you can change the door flag, which you'd normally do by opening the door, but you can't do that for these grey doors because they have no clear condition (some grey doors have clear conditions like a boss dead or enemy count cleared, but you can set them to not have one). Thus removing the flag has no effect other than a minor performance hit, which is a good trade for the ability to go into the practice hack menu and have these doors be opened if desired.

I'm tempted to merge this in tonight. I am going to do a little more testing first; maybe it'll merge in tomorrow. Soon either way.