fix: Fixes BitArray serialization (#1027)

Fixes bit array serialization. This may cause objects that were serialized by bit array to fail to deserialize. I am sorry, please accept my condolences. It is probably easiest to just delete those objects. If it becomes a major problem, contact me and I'll help with a hacky per-case solution.

Projects/Server.Tests/Tests/Collections/BitArrayTests.cs

@@ -0,0 +1,29 @@
+using Server.Collections;
+using Xunit;
+
+namespace Server.Tests;
+
+public class BitArrayTests
+{
+    [Fact]
+    public void TestBitArray()
+    {
+        var bitArray = new BitArray(700); // Restricted Spells;
+        bitArray.Set(5, true);
+        bitArray.Set(39, true);
+        bitArray.Set(125, true);
+
+        // Simulate World Saving
+        var writer = new BufferWriter(1024, false);
+        writer.Write(bitArray); // Save it to a file
+
+        // Simulate World Loading
+        var reader = new BufferReader(writer.Buffer);
+        var bitArrayTest = reader.ReadBitArray();
+        Assert.Equal(700, bitArrayTest.Length);
+        for (var i = 0; i < bitArrayTest.Length; i++)
+        {
+            Assert.Equal(i is 5 or 39 or 125, bitArrayTest.Get(i));
+        }
+    }
+}