Specify path to Cargo.toml when generating wix for package

[pnehrer]

To avoid an error when generating a wix file for a package whose Cargo.toml is in a sub-folder, specify the full path to the package's Cargo.toml.

Fixes Issue #1453.

[mistydemeo]

Good catch, thank you! We're prepping a release right now, but I'll review and test this afterwards.

[mistydemeo]

Gave it a test to confirm this doesn't negatively effect wix projects in the standard root path. Looking good - thanks for this!

[pnehrer]

Outstanding, thank you! 🙂