Makes dog beds anchored. (#3139)

<!-- Write **BELOW** The Headers and **ABOVE** The comments else it may
not be viewable. -->
<!-- You can view Contributing.MD for a detailed description of the pull
request process. -->

## About The Pull Request
Title.
<!-- Describe The Pull Request. Please be sure every change is
documented or this can delay review and even discourage maintainers from
merging your PR! -->

## Why It's Good For The Game
Mobs buckled can just. Walk with it.
<!-- Please add a short description of why you think these changes would
benefit the game. If you can't justify it in words, it might not be
worth adding. -->

## Changelog

:cl:
fix: Dog beds start anchored now. Mobs can no longer move while buckled.
/:cl:

<!-- Both :cl:'s are required for the changelog to work! You can put
your name to the right of the first :cl: if you want to overwrite your
GitHub username as author ingame. -->
<!-- You can use multiple of the same prefix (they're only used for the
icon ingame) and delete the unneeded ones. Despite some of the tags,
changelogs should generally represent how a player might be affected by
the changes rather than a summary of the PR's contents. -->

code/game/objects/structures/beds_chairs/bed.dm

@@ -167,30 +167,26 @@
 	name = "dog bed"
 	icon_state = "dogbed"
 	desc = "A comfy-looking dog bed. You can even strap your pet in, in case the gravity turns off."
-	anchored = FALSE
+	anchored = TRUE
 	buildstacktype = /obj/item/stack/sheet/mineral/wood
 	buildstackamount = 10
 	var/mob/living/owner = null
 
 /obj/structure/bed/dogbed/ian
 	desc = "Ian's bed! Looks comfy."
 	name = "Ian's bed"
-	anchored = TRUE
 
 /obj/structure/bed/dogbed/cayenne
 	desc = "Seems kind of... fishy."
 	name = "Cayenne's bed"
-	anchored = TRUE
 
 /obj/structure/bed/dogbed/renault
 	desc = "Renault's bed! Looks comfy. A foxy person needs a foxy pet."
 	name = "Renault's bed"
-	anchored = TRUE
 
 /obj/structure/bed/dogbed/runtime
 	desc = "A comfy-looking cat bed. You can even strap your pet in, in case the gravity turns off."
 	name = "Runtime's bed"
-	anchored = TRUE
 
 /obj/structure/bed/dogbed/proc/update_owner(mob/living/M)
 	if(owner)