Don't pass a break scope to `Builder::break_for_else`

This method would previously take a target scope, and then verify that it
was equal to the scope on top of the if-then scope stack.

In practice, this means that callers have to go out of their way to pass around
redundant scope information that's already on the if-then stack.

So it's easier to just retrieve the correct scope directly from the if-then
stack, and simplify the other code that was passing it around.

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