Machinery: Always use update_use_power()

code/modules/hydroponics/seed_machines.dm

@@ -37,7 +37,7 @@
 	icon_state = "hydrotray3"
 	density = 1
 	anchored = 1
-	use_power = 1
+	use_power = USE_POWER_IDLE
 
 	var/obj/item/seeds/seed // Currently loaded seed packet.
 	var/obj/item/weapon/disk/botany/loaded_disk //Currently loaded data disk.

code/modules/hydroponics/seed_storage.dm

@@ -24,7 +24,7 @@
 	icon_state = "seeds"
 	density = 1
 	anchored = 1
-	use_power = 1
+	use_power = USE_POWER_IDLE
 	idle_power_usage = 100
 
 	var/seeds_initialized = 0 // Map-placed ones break if seeds are loaded right at the start of the round, so we do it on the first interaction

code/modules/hydroponics/trays/tray_soil.dm

@@ -2,7 +2,7 @@
 	name = "soil"
 	icon_state = "soil"
 	density = 0
-	use_power = 0
+	use_power = USE_POWER_OFF
 	mechanical = 0
 	tray_light = 0
 	frozen = -1