LibHTTP: Make HttpRequest default-movable

Otherwise, clangd correctly warns that this type is only copyable.

(cherry picked from commit db1bcb2c5600c98a33f48fdb68e16ac68e5a8e25)

Userland/Libraries/LibHTTP/HttpRequest.h

@@ -9,6 +9,7 @@
 
 #include <AK/ByteBuffer.h>
 #include <AK/ByteString.h>
+#include <AK/Noncopyable.h>
 #include <AK/Optional.h>
 #include <AK/Vector.h>
 #include <LibCore/Forward.h>
@@ -64,6 +65,8 @@ public:
     HttpRequest() = default;
     ~HttpRequest() = default;
 
+    AK_MAKE_DEFAULT_MOVABLE(HttpRequest);
+
     ByteString const& resource() const { return m_resource; }
     HeaderMap const& headers() const { return m_headers; }