Before modify script not called when install command is used to upgrade

### What You Are Seeing?

If I have a package already installed and then I call:

`choco install package --version `

The before modify script doesn't get run, even though that seems to me like it should be an upgrade scenario. The script does get run if I call:

`choco upgrade package --version `
### What is Expected?

IMHO, if the upgrade command can install a package that doesn't exist, then the install command should detect an upgrade scenario if you aren't installing side-by-side.
### How Did You Get This To Happen? (Steps to Reproduce)

Detailed above