Fix a bunch of compiler warnings (#10518)

Content.Server/Atmos/EntitySystems/AtmosExposedSystem.cs

@@ -52,7 +52,7 @@ namespace Content.Server.Atmos.EntitySystems
         public AtmosExposedGetAirEvent(EntityUid entity, bool invalidate = false)
         {
             Entity = entity;
-            invalidate = invalidate;
+            Invalidate = invalidate;
         }
     }
 }

Content.Server/Atmos/Piping/Binary/EntitySystems/GasPassiveGateSystem.cs

@@ -13,7 +13,6 @@ namespace Content.Server.Atmos.Piping.Binary.EntitySystems
     public sealed class GasPassiveGateSystem : EntitySystem
     {
         [Dependency] private readonly AtmosphereSystem _atmosphereSystem = default!;
-        [Dependency] private readonly ExamineSystemShared _examineSystem = default!;
 
         public override void Initialize()
         {

Content.Server/Atmos/Piping/Unary/EntitySystems/GasCanisterSystem.cs

@@ -24,7 +24,6 @@ namespace Content.Server.Atmos.Piping.Unary.EntitySystems
         [Dependency] private readonly UserInterfaceSystem _userInterfaceSystem = default!;
         [Dependency] private readonly AtmosphereSystem _atmosphereSystem = default!;
         [Dependency] private readonly IAdminLogManager _adminLogger = default!;
-        [Dependency] private readonly PricingSystem _pricing = default!;
         [Dependency] private readonly SharedHandsSystem _handsSystem = default!;
 
         public override void Initialize()