Fix icons for autoit and mysql

This should be fine now.
I noticed that in the Chocolatey Gallery all the autoit packages and all the 7zip packages have the wrong iconurl. They link to the files in the *nugetpackages* repository instead of *chocolateyautomaticpackages* where the icons are stored. So you have to manually push these packages from this repository after merging this pull request with increased version numbers.
Otherwise this pull request won’t make much sense.