Modifier keys don't work in Windows detachable console

I keep forgetting about this. Pretty sure this was a result of moving the modifer updates to I_OsPolling.

https://mb.srb2.org/showthread.php?t=47629

changed the description

Hey Are You Done Yet 2.2.5

mentioned in merge request !1112 (merged)

closed via merge request !1112 (merged)

mentioned in commit 8beee376

mentioned in issue #316