Removed fixed timestep logic from GameScreen (redundant now because the logic is handled in GameMain)

Subsurface/Source/Items/Components/Machines/Deconstructor.cs

@@ -87,7 +87,7 @@ namespace Barotrauma.Items.Components
 
         public override void UpdateHUD(Character character)
         {
-            GuiFrame.Update((float)Physics.step);
+            GuiFrame.Update((float)Timing.Step);
         }
 
         private bool ToggleActive(GUIButton button, object obj)

Subsurface/Source/Items/Components/Machines/Fabricator.cs

@@ -350,7 +350,7 @@ namespace Barotrauma.Items.Components
                 activateButton.Enabled = CanBeFabricated(targetItem, character);
             }
 
-            GuiFrame.Update((float)Physics.step);
+            GuiFrame.Update((float)Timing.Step);
         }
 
         private bool CanBeFabricated(FabricableItem fabricableItem, Character user)

Subsurface/Source/Items/Components/Turret.cs

@@ -366,7 +366,7 @@ namespace Barotrauma.Items.Components
 
                     break;
                 case "trigger_in":
-                    item.Use((float)Physics.step, null);
+                    item.Use((float)Timing.Step, null);
                     break;
             }
         }