fix: Windows installer downloads incorrect release artifact

[Phoenix2066]

Hey! I was trying to install GitX on Windows using install.ps1, but the installer fails with a 404 when trying to download the release.

It looks like the installer is generating:
gitx_1.4.0_windows_amd64.zip

while the release artifact is named:
gitx_Windows_x86_64.zip

So I think there's a mismatch between the filename the installer expects and the filename generated by GoReleaser.

I tested changing the installer to use the GoReleaser naming convention, and it worked correctly on my Windows AMD64 machine.

I'm happy to submit a PR with the fix if this is the expected approach.

[bakayu]

On windows people generally used git-bash if they want to use the terminal for git at all, or simply use wsl. Please test if your fix works with git-bash and make a PR.
Thanks.

[Phoenix2066]

Thanks!
I tested the fix with Git Bash on Windows AMD64 as suggested. The original installer returns a 404 error because it looks for gitx_1.4.0_windows_amd64.zip, while the release artifact is gitx_Windows_x86_64.zip.

After updating install.ps1 to use the GoReleaser naming convention, I tested it successfully from both Git Bash and PowerShell.

I'll open a PR with the fix.