input: don't let multi-key bindings block simple key bindings

Key bindings can include mutiple keys at once (additional to key
modifiers like ctrl etc.). This becomes annoying when quickly switching
between two bound keys, e.g. when seeking back and forth, you might end
up hitting the "left" and "right" keys at once. The user doesn't expect
to invoke the key binding "left-right", but would prefer a key stroke to
invoke the binding it was supposed to invoke.

So if there's no binding for a multi-key combination, try to find a
binding for the key last held down. This preserves the ability to define
multi-key combinations, while the common case works as expected.

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