Fix compilation errors in tests from update (#34272)

Required for https://github.com/space-wizards/RobustToolbox/pull/5590 to not cause compile fails, but can be merged on its own

Content.IntegrationTests/Tests/GameObjects/Components/Mobs/AlertsComponentTests.cs

@@ -35,7 +35,7 @@ namespace Content.IntegrationTests.Tests.GameObjects.Components.Mobs
             {
                 playerUid = serverPlayerManager.Sessions.Single().AttachedEntity.GetValueOrDefault();
 #pragma warning disable NUnit2045 // Interdependent assertions.
-                Assert.That(playerUid, Is.Not.EqualTo(default));
+                Assert.That(playerUid, Is.Not.EqualTo(default(EntityUid)));
                 // Making sure it exists
                 Assert.That(entManager.HasComponent<AlertsComponent>(playerUid));
 #pragma warning restore NUnit2045

Content.IntegrationTests/Tests/PostMapInitTest.cs

@@ -17,7 +17,6 @@ using Robust.Shared.Map;
 using Robust.Shared.Map.Components;
 using Robust.Shared.Prototypes;
 using Content.Shared.Station.Components;
-using FastAccessors;
 using Robust.Shared.Utility;
 using YamlDotNet.RepresentationModel;