fix: optimization: PVS-Studio warning V832

It's better to use '= default;' syntax instead of empty constructor and destructor body.
Using '= default;' can help the compiler generate more optimal code.

Reported by: PVS-Studio

Signed-off-by: Vyacheslav Ivanov <islavaivanov76@gmail.com>

src/graphics/core/ImageData.cpp

@@ -41,8 +41,7 @@ ImageData::ImageData(ImageFormat format, uint width, uint height, const ubyte* d
     std::memcpy(this->data.get(), data, width * height * pixsize);
 }
 
-ImageData::~ImageData() {
-}
+ImageData::~ImageData() = default;
 
 void ImageData::flipX() {
     switch (format) {