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/content/ContentBuilder.cpp

@@ -2,7 +2,7 @@
 
 #include "../objects/rigging.hpp"
 
-ContentBuilder::~ContentBuilder() {}
+ContentBuilder::~ContentBuilder() = default;
 
 void ContentBuilder::add(std::unique_ptr<ContentPackRuntime> pack) {
     packs[pack->getId()] = std::move(pack);