Slightly improve readability of sed commands in plumber

plumber

@@ -4,7 +4,7 @@ rand_inst() # Choose a random invidious instance to distribute load.
             # Good digital citizenship is important, you know.
 {
    case $(($(dd bs=2 count=1 if=/dev/random of=/dev/stdout | od - | \
-          sed -ne 's/  */ /gp' | cut -d ' ' -f2) % 3)) in
+          sed -ne 's&  *& &gp' | cut -d ' ' -f2) % 3)) in
      0) printf "vid.puffyan.us" ;;
      1) printf "ytprivate.com" ;;
      2) printf "yewtu.be" ;;
@@ -15,11 +15,11 @@ if [ "$(printf "%s" "${1}"|cut -b 1,2,3,4)" = "http" ]
 then
    case "${1}" in
       *youtu*) exec Links "$(printf "%s" "${1}"|sed -ne \
-                           "s/\(http.*:\/\/\).*\(\/.*\)/\1$(rand_inst)\2/p")" & ;;
+                           "s&\(http.*://\).*\(/.*\)&\1$(rand_inst)\2&p")" & ;;
       *reddit*) exec Links "$(printf "%s" "${1}"|sed -ne \
-                           "s/\(http.*:\/\/\).*\(\/.*\/\)/\1libredd.it\2/p")" & ;;
-      https://4chan.org*) exec Links "$(printf "%s" "${1}"|sed -ne \
-                              "s/4chan/4channel/p")" ;;
+                           "s&\(http.*://\).*\(/.*/\)&\1libredd.it\2&p")" & ;;
+      *4chan.org*) exec Links "$(printf "%s" "${1}"|sed -ne \
+                              "s&4chan&4channel&p")" & ;;
       *) exec Links "${1}" & ;;
    esac