`TryInstallPip` should return true if `pip` is already installed

[JimiC]

In my opinion, the returned value of IsPipInstalled should be returned.

• https://github.com/henon/Python.Included/blob/11b6b2a29b8ce57bbcd8cfe3722efa4467cd154d/Python.Included/Installer.cs#L211
• https://github.com/henon/Python.Included/blob/eb0cce2a7599a23e38cfb669cd86abff04ca37e2/Python.Deployment/Installer.cs#L343

On first use, TryInstallPip returns true but if you call it again when pip is already installed it returns false. I'm expecting the return value to be true if pip is already installed.

[henon]

Done

https://www.nuget.org/packages/Python.Deployment/1.5.0 https://www.nuget.org/packages/Python.Included/3.10.0-preview5