Refactors how circuit size is calculated. Fixed module circuit size not taking up capacity equal to the amount of circuit components inside of it. (#61554)

Co-authored-by: Watermelon914 <3052169-Watermelon914@users.noreply.gitlab.com>

code/modules/wiremod/components/utility/getter.dm

@@ -15,6 +15,8 @@
 
 	var/datum/circuit_variable/current_variable
 
+	circuit_size = 0
+
 /obj/item/circuit_component/getter/populate_options()
 	variable_name = add_option_port("Variable", null)
 

code/modules/wiremod/components/utility/setter.dm

@@ -19,6 +19,8 @@
 
 	var/current_type
 
+	circuit_size = 0
+
 /obj/item/circuit_component/setter/populate_options()
 	variable_name = add_option_port("Variable", null)