Fixes initial floating action buttons failing to properly position (#67068)

Also cleans up artificer stuff a bit, their rune button should align
with their spells.

Basically, when we grant someone a button, it gets positioned in its
default location. If the button's floating, their location var becomes
an invalid arg to position_action. Then we called position action with
their location var.

Big fucky.

I've cleaned up the logic a bit, and ensured that you can never position
to FLOATING directly, since it's a marker rather then a real position on
the screen

code/modules/mob/living/simple_animal/constructs.dm

@@ -63,6 +63,8 @@
 		spellnum++
 	if(runetype)
 		var/pos = 2+spellnum*31
+		if(construct_spells.len >= 4)
+			pos -= 31*(construct_spells.len - 4)
 		our_rune = new runetype(src)
 		our_rune.default_button_position = "6:[pos],4:-2" // Set the default position to this random position
 		our_rune.Grant(src)