Simplify testCrc32 slightly

Signed-off-by: Graham <gpe@openrs2.org>

buffer/src/test/kotlin/org/openrs2/buffer/ByteBufExtensionsTest.kt

@@ -421,12 +421,9 @@ object ByteBufExtensionsTest {
         }
 
         // Tests the nioBufferCount() == 1 case.
-        copiedBuffer(s).use { buf ->
+        ByteBufAllocator.DEFAULT.directBuffer().use { directBuf ->
-            ByteBufAllocator.DEFAULT.directBuffer().use { directBuf ->
+            directBuf.writeCharSequence(s, Charsets.UTF_8)
-                directBuf.writeBytes(buf)
+            assertEquals(0x414FA339, directBuf.crc32(2, directBuf.writerIndex() - 3))
-
-                assertEquals(0x414FA339, directBuf.crc32(2, directBuf.writerIndex() - 3))
-            }
         }
 
         // Tests the nioBufferCount() > 1 case.