Add clearer defib cooldowns! (#31251)

* First commit

* Fix silly test

* Swiched stuff up

* Update Content.Shared/Medical/DefibrillatorComponent.cs

* remove unneeded visuals

---------

Co-authored-by: slarticodefast <161409025+slarticodefast@users.noreply.github.com>

Resources/Prototypes/Entities/Objects/Specific/Medical/defib.yml

@@ -13,9 +13,6 @@
           map: [ "enum.ToggleVisuals.Layer" ]
           visible: false
           shader: unshaded
-        - state: ready
-          map: ["enum.PowerDeviceVisualLayers.Powered"]
-          shader: unshaded
     - type: Appearance
     - type: GenericVisualizer
       visuals:
@@ -23,10 +20,6 @@
           enum.ToggleVisuals.Layer:
             True: { visible: true }
             False: { visible: false }
-        enum.DefibrillatorVisuals.Ready:
-          enum.PowerDeviceVisualLayers.Powered:
-            True: { visible: true }
-            False: { visible: false }
     - type: Item
       size: Large
     - type: Speech