Windows build cannot handle a space in the name

[andydotxyz]

Describe the bug:

Running Fyne-cross windows when the FyneApp.toml name contains a space creates:

[✓] "bin" dir cleaned: /app/fyne-cross/bin/windows-arm64
[✓] "dist" dir cleaned: /app/fyne-cross/dist/windows-arm64
[✓] "temp" dir cleaned: /app/fyne-cross/tmp/windows-arm64
[i] Checking for go.mod: /Users/andy/Code/Fyne/fyne/cmd/fyne_demo/go.mod
[i] go.mod not found, creating a temporary one...
go: malformed module path "Fyne Demo.exe": invalid char ' '

To Reproduce:

Steps to reproduce the behaviour:

1. Put a space in the name of a FyneApp.toml
2. Run Fyne-cross windows

Device and debug info (please complete the following information):

Device info

• OS: MacOS
• Version: Ventura
• Go version: 1.20
• fyne-cross version: 1.4.0
• Fyne version: 2.3.3