Installation instructions for Windows package no longer apply

[msp2]

In https://github.com/kahst/BirdNET-Analyzer#setup-windows

the clause,

If Windows does not display this option, the file can be unblocked with the PowerShell 7 command Unblock-File -Path .\BirdNET-Analyzer.zip

is no longer appropriate since the installer download is an .exe file

https://github.com/kahst/BirdNET-Analyzer/releases/download/v1.3.1/BirdNET-Analyzer-1.3.1-win.exe