Vehicle interaction window: hotkeys and drawing

[narc0tiq]

Two minor interface issues that are probably fixable from the same places:

• when changing the hotkey assigned to one of the vehicle interaction keys (e.g. rem<o>ve), the highlighted letter in the menu at the top remains the same, even though 'o' no longer performs that action. Correct behaviour should probably be to try to find a letter in the word "remove" that can be highlighted, or not highlight any letter at all (bonus points: show something like remove [n] -- but this may break on min-size displays. The menu in veh_interact is already close to the 80-column limit (in English/unlocalized)).
• when the keybindings screen is closed, the vehicle interaction window does not redraw and the player must close and reopen it.

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[Leland]

Second note has an issue for it in #8514.