Revert "Core/Misc: Replace time(NULL) with GameTime::GetGameTime()"

This reverts commit 5fe3a1f7f9.

src/server/game/Handlers/CharacterHandler.cpp

@@ -133,7 +133,7 @@ bool LoginQueryHolder::Initialize()
 
     stmt = CharacterDatabase.GetPreparedStatement(CHAR_SEL_CHARACTER_MAILCOUNT);
     stmt->setUInt32(0, lowGuid);
-    stmt->setUInt64(1, uint64(GameTime::GetGameTime()));
+    stmt->setUInt64(1, uint64(time(nullptr)));
     res &= SetPreparedQuery(PLAYER_LOGIN_QUERY_LOAD_MAIL_COUNT, stmt);
 
     stmt = CharacterDatabase.GetPreparedStatement(CHAR_SEL_CHARACTER_MAILDATE);