LibGfx: Give ICC::TagType a virtual destructor

ICC::Profile deletes these objects via base class pointers, so this
is needed that destructors in the subclasses get called.

(Found by asan on CI when adding test coverage.)

Userland/Libraries/LibGfx/ICC/TagTypes.h

@@ -34,6 +34,8 @@ public:
     u32 size() const { return m_size; }
     TagTypeSignature type() const { return m_type; }
 
+    virtual ~TagData() = default;
+
 protected:
     TagData(u32 offset, u32 size, TagTypeSignature type)
         : m_offset(offset)