Fix detecting Windows Terminal on WSL2

[CarterLi]

Used logic from https://github.com/dylanaraps/neofetch/blob/master/neofetch#L3293

As for

    if(result->terminalProcessName.length == 0)
        ffStrbufAppendS(&result->terminalProcessName, term);

Since we can only get here when terminalProcessName equals to login systemd init 0, we should always use a better name

Result (with patch applied):

[LinusDierheimer]

What happens when SSH_CONNECTION is set, but SSH_TTY is not, or empty?

[CarterLi]

What happens when SSH_CONNECTION is set, but SSH_TTY is not, or empty?

How can it happen?

[LinusDierheimer]

I don't know, but during development of this project i learned that everything is possible. Just do something like this:

char* term;

//SSH
if(getnev("SSH_CONNECTION") != NULL)
    term = getenv("SSH_TTY");

//Windows Terminal
if((term == NULL || *term == '\0') && getenv("WT_SESSION") != NULL)
    term = "Windows Terminal";

//Normal Terminal
if(term == NULL || *term == '\0')
    term = getenv("TERM");

//TTY
if(term == NULL || *term == '\0' || strcasecmp(term, "linux") == 0)
    term = ttyname(STDIN_FILENO);

[LinusDierheimer]

Thanks for figuring out. Ignore codefactor complaining about complex method.