Fix some build warnings (#6832)

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Shared/Friction/TileFrictionModifier.cs

@@ -9,8 +9,7 @@ using Robust.Shared.ViewVariables;
 namespace Content.Shared.Friction
 {
     [RegisterComponent]
-    [ComponentProtoName("TileFrictionModifier")]
-    public sealed class SharedTileFrictionModifier : Component
+    public sealed class TileFrictionModifierComponent : Component
     {
         /// <summary>
         ///     Multiply the tilefriction cvar by this to get the body's actual tilefriction.
@@ -43,7 +42,7 @@ namespace Content.Shared.Friction
         }
 
         [NetSerializable, Serializable]
-        protected sealed class TileFrictionComponentState : ComponentState
+        private sealed class TileFrictionComponentState : ComponentState
         {
             public float Modifier;