AK: Use AK_MAKE_DEFAULT_MOVABLE to avoid mistakes in default impls

Author: https://github.com/BenWiederhake
Commit: 041f5e931d
Pull-request: https://github.com/SerenityOS/serenity/pull/19422

AK/CircularBuffer.h

@@ -15,14 +15,12 @@ namespace AK {
 
 class CircularBuffer {
     AK_MAKE_NONCOPYABLE(CircularBuffer);
+    AK_MAKE_DEFAULT_MOVABLE(CircularBuffer);
 
 public:
     static ErrorOr<CircularBuffer> create_empty(size_t size);
     static ErrorOr<CircularBuffer> create_initialized(ByteBuffer);
 
-    CircularBuffer(CircularBuffer&& other) = default;
-    CircularBuffer& operator=(CircularBuffer&& other) = default;
-
     ~CircularBuffer() = default;
 
     size_t write(ReadonlyBytes bytes);