Simplify testCrc32 slightly

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

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

@@ -421,13 +421,10 @@ object ByteBufExtensionsTest {
         }
 
         // Tests the nioBufferCount() == 1 case.
-        copiedBuffer(s).use { buf ->
         ByteBufAllocator.DEFAULT.directBuffer().use { directBuf ->
-                directBuf.writeBytes(buf)
+            directBuf.writeCharSequence(s, Charsets.UTF_8)
-
             assertEquals(0x414FA339, directBuf.crc32(2, directBuf.writerIndex() - 3))
         }
-        }
 
         // Tests the nioBufferCount() > 1 case.
         Unpooled.wrappedBuffer(