Fix console crash and console key input

[VReaperV]

• Fixes a crash in auto-complete (start typing a command, move cursor back to start of the line, press tab)
• Fixes console key sometimes being caught in the console input sometimes. This one's a bit difficult to reproduce, I've mainly seen it happen when tabbing out before/during a map change with console open, then tabbing back in after the map loads and opening the console again. Also reproducible by setting input method to UK English in Windows 11, though it has a different underlying cause