Windows: Stack is always installed regardless of the choice

On Windows/PowerShell, the user is asked if he/she wants to install Stack (default: No). But, even if "No" is selected, Stack is installed.

It seems bootstrap-haskell.ps1 sets BOOTSTRAP_HASKELL_INSTALL_STACK=1 but bootstrap-haskell checks for BOOTSTRAP_HASKELL_INSTALL_NO_STACK.

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