Logger Sawmill Cleanup (#2413)

# Description
Cleaned up Logger obsolete compiler warnings in non robust code.
Should probably be changed to a ISawmill reference in classes to avoid
repeated lookups in heavy logging logic.
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# Changelog

🆑

- tweak: Logger to Logger.GetSawmill("name");

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Co-authored-by: ilmenwe <no@mail.com>

(cherry picked from commit 2e8ffd971716d38dc6d5a520bebdf88b743045a3)

Content.Client/UserInterface/Controls/SlotControl.cs

@@ -34,7 +34,7 @@ namespace Content.Client.UserInterface.Controls
                 //this auto registers the button with it's parent container when it's set
                 if (_slotNameSet)
                 {
-                    Logger.Warning("Tried to set slotName after init for:" + Name);
+                    Logger.GetSawmill("slot.control").Warning("Tried to set slotName after init for:" + Name);
                     return;
                 }
                 _slotNameSet = true;