LibGfx/ISOBMFF: FileTypeBox is not a FullBox

Userland/Libraries/LibGfx/ImageFormats/ISOBMFF/Boxes.cpp

@@ -88,7 +88,7 @@ ErrorOr<void> FileTypeBox::read_from_stream(BoxStream& stream)
 
 void FileTypeBox::dump(String const& prepend) const
 {
-    FullBox::dump(prepend);
+    Box::dump(prepend);
 
     auto indented_prepend = add_indent(prepend);
 

Userland/Libraries/LibGfx/ImageFormats/ISOBMFF/Boxes.h

@@ -85,7 +85,7 @@ private:
     virtual void dump(String const& prepend = {}) const override;
 
 // 4.3 File Type Box
-struct FileTypeBox final : public FullBox {
+struct FileTypeBox final : public Box {
     BOX_SUBTYPE(FileTypeBox);
 
     BrandIdentifier major_brand { BrandIdentifier::None };