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/Atlas.hpp

@@ -47,7 +47,7 @@ class AtlasBuilder {
     std::vector<atlasentry> entries;
     std::set<std::string> names;
 public:
-    AtlasBuilder() {}
+    AtlasBuilder() = default;
     void add(const std::string& name, std::unique_ptr<ImageData> image);
     bool has(const std::string& name) const;
     const std::set<std::string>& getNames() { return names; };