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/PacksManager.cpp

@@ -5,8 +5,7 @@
 #include <queue>
 #include <sstream>
 
-PacksManager::PacksManager() {
-}
+PacksManager::PacksManager() = default;
 
 void PacksManager::setSources(std::vector<fs::path> sources) {
     this->sources = sources;
@@ -19,7 +18,7 @@ void PacksManager::scan() {
     for (auto& folder : sources) {
         ContentPack::scanFolder(folder, packsList);
         for (auto& pack : packsList) {
-            packs.emplace(pack.id, pack);
+            packs.try_emplace(pack.id, pack);
         }
     }
 }