DialogSwapper: fix broken ipairs iteration

[petzku]

Using moonscript's built-in *table iteration
alternatively it would be i, pair in ipairs(...)

[petzku]

without this fix, the script errors with the following message:

Lua reported a runtime error:
    File "...\autoload\Flux.DialogSwapper.moon", line 166
<anonymous function at lines 153-154>
attempt to index local 'pair' (a number value)