fix(maker-wix): correct path to distributable

[liudonghua123]

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Summarize your changes:

Fixes #608.

[MarshallOfSound]

Good catch 🙇

[malept]

Hmmm. Shouldn't the maker specs test that the output file paths returned exist?

[MarshallOfSound]

@malept In this case the tests were passing because the file returned from the maker msiFile did actually exist, it was just in a stupid place 😆 We might be able to add a path.relative test to ensure it isn't in a stupid place in the future

[mako-taco]

Can we get this merged? The 2 failing test cases are also affecting my completely unrelated changes in #623, which makes me think they are also unrelated to these changes.

[malept]

I'd like it if the test that was mentioned in the comments here were addressed before we merge, to avoid problems like this in the future.

[malept]

I think I've written a regression test for this (2392832) but the tests are failing due to failures that are also in master.