Update run_in_terminal_window.sh

[Silipwn]

Remove the TERM variable dependency.

Usually, the TERM variable is user's preference.

[Ryanf55]

What environment does this not currently work on master branch?

[Silipwn]

I can explain my case here.

I usually work in a TMUX environment, but I have the $TERM variable set to tmux-256color to enable full color support. ref

And it's not necessary that you'd have the $SCREEN variable set to screen (Even though that's the default config).
Removing the check for $TERM just makes it easier for everyone to use this.

[peterbarker]

Fixed the commit message.