Get correct ApplicationData dir on linux/wine

[Jannify]

When inside the wine environment Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) points to the very nested virtual wine folder. With this change Nitrox detects the wine environment and returns the dir normally used on linux.

[Measurity]

Should add check for IndexOutOfRange errors.

I'm assuming .config folder always exists in winehome:

Suggested change

	string applicationData;
	/// <summary>
	/// Tries to get the launcher path that was previously saved by other Nitrox code.
	/// </summary>
	public static string LauncherPath
	// On linux Environment.SpecialFolder.ApplicationData returns the windows version inside wine, this bypasses that
	string homeInWine = Environment.GetEnvironmentVariable("WINEHOMEDIR");
	if (homeInWine != null && Directory.Exists(homeInWine[4..])) // WINEHOMEDIR is prefixed with \??\
	{
	applicationData = Path.Combine(homeInWine[4..], ".config");
	}
	else
	{
	applicationData = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
	}
	string applicationData = null;
	if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
	{
	// On linux Environment.SpecialFolder.ApplicationData returns the Windows version inside wine, this bypasses that
	string homeInWineEnv = Environment.GetEnvironmentVariable("WINEHOMEDIR");
	if (homeInWineEnv is { Length: > 4 } && homeInWineEnv[4..] is {} homeInWine) // WINEHOMEDIR is prefixed with \??\
	{
	if (Directory.Exists(homeInWine))
	{
	applicationData = Path.Combine(homeInWine, ".config");
	}
	}
	}
	if (!Directory.Exists(applicationData))
	{
	applicationData = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
	}