Fix remove_mono breaks dotnet40 on subsequent dotnet* installs #2101
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We should not be removing mscoree.dll in all dotnet* installs because it could have been placed by the dotnet40 verb, which would cause subsequent dotnet* verbs to break dotnet40. The deletion should instead only happen when the native dotnet is detected. We continue to remove the registry keys in any case, though, since they are only relevant to the native DLL.
Closes #2072