refactor(Core): apply clang-tidy modernize-use-equals-default (#3834)

src/server/shared/Network/RealmSocket.cpp

@@ -11,9 +11,10 @@
 #include "RealmSocket.h"
 #include "Log.h"
 
-RealmSocket::Session::Session() { }
 
-RealmSocket::Session::~Session() { }
+RealmSocket::Session::Session() = default;
+
+RealmSocket::Session::~Session() = default;
 
 RealmSocket::RealmSocket() :
     input_buffer_(4096), session_(nullptr),

src/server/shared/Realms/RealmList.h

@@ -46,7 +46,7 @@ public:
     typedef std::map<std::string, Realm> RealmMap;
 
     RealmList();
-    ~RealmList() { }
+    ~RealmList() = default;
 
     static RealmList* instance();