Remove faulty tmux support

Tmux's PPid is the 1, so skipping that makes the term your init

fet.sh

@@ -33,7 +33,7 @@ if [ -e /proc/$$/comm ]; then
 		# get name of binary
 		read -r name < "/proc/$ppid/comm"
 		case $name in
-			*sh|"${0##*/}"|tmux*) ;;  # skip shells
+			*sh|"${0##*/}") ;;  # skip shells
 			*[Ll]ogin*|*init*) break;;  # exit when the top is reached
 			*) term="$name"  # anything else can be assumed to be the terminal
 		esac