fix: bug in sed command

fresh.sh

@@ -192,7 +192,7 @@ com() {
 add_after() {
     # Example:
     # add_after "Color" "ILoveCandy" "$HOME/test/pacman.conf"
-    sed -i '/$2/d'
+    sed -i '/'"$2"'/d'
     sed -i '/'"$1"'/a '"$2"'' $3
 }