Core/Guild: Fix memory leak on Guild disband

Fix memory leak when disbanding a Guild, removed from GuildMgr but never deleted. Due to the different ways of how Guild::Disband() and Guild::DeleteMember() are called, each call to these methods has a different way to delete the Guild if empty/invalid.

Valgrind log:
 2,127 (240 direct, 1,887 indirect) bytes in 1 blocks are definitely lost in loss record 54 of 81
  at operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
  by guild_commandscript::HandleGuildCreateCommand(ChatHandler*, char const*) (cs_guild.cpp:91)
  by ChatHandler::ExecuteCommandInTable(ChatCommand*, char const*, std::string const&) (Chat.cpp:339)
  by ChatHandler::ExecuteCommandInTable(ChatCommand*, char const*, std::string const&) (Chat.cpp:320)
  by ChatHandler::ParseCommands(char const*) (Chat.cpp:466)
  by WorldSession::HandleMessagechatOpcode(WorldPacket&) (ChatHandler.cpp:217)
  by WorldSession::Update(unsigned int, PacketFilter&) (WorldSession.cpp:317)
  by World::UpdateSessions(unsigned int) (World.cpp:2632)
  by World::Update(unsigned int) (World.cpp:1989)
  by WorldRunnable::run() (WorldRunnable.cpp:60)
  by ACE_Based::Thread::ThreadTask(void*) (Threading.cpp:186)
  by ACE_OS_Thread_Adapter::invoke() (in /usr/lib/libACE-6.0.3.so)

1 files changed, 2 insertions, 1 deletions

diff --git a/src/server/scripts/Commands/cs_guild.cpp b/src/server/scripts/Commands/cs_guild.cpp
index 0af0da10846..040c68dbacb 100644
--- a/src/server/scripts/Commands/cs_guild.cpp
+++ b/src/server/scripts/Commands/cs_guild.cpp
@@ -118,6 +118,7 @@ public:
             return false;
 
         targetGuild->Disband();
+        delete targetGuild;
 
         return true;
     }
@@ -164,7 +165,7 @@ public:
         if (!targetGuild)
             return false;
 
-        targetGuild->DeleteMember(targetGuid, false, true);
+        targetGuild->DeleteMember(targetGuid, false, true, true);
         return true;
     }