[Bug Fix] Fix trader mode (#4397)

* Fix bazaar trading

* Update `constexpr`

* Added world trader table truncate on boot to ensure that the trader table is always empty when world starts.

---------

Co-authored-by: Mitch Freeman <65987027+neckkola@users.noreply.github.com>

common/database.cpp

@@ -77,6 +77,7 @@
 #include "zone_store.h"
 #include "repositories/merchantlist_temp_repository.h"
 #include "repositories/bot_data_repository.h"
+#include "repositories/trader_repository.h"
 
 extern Client client;
 
@@ -2104,3 +2105,8 @@ void Database::ClearGuildOnlineStatus()
 {
 	GuildMembersRepository::ClearOnlineStatus(*this);
 }
+
+void Database::ClearTraderDetails()
+{
+	TraderRepository::Truncate(*this);
+}