Fix world update duplicate call

[Rochet2]

[22.8.2016 21:24:52] Pursche: Although I did find something interesting
[22.8.2016 21:24:55] Pursche: World.cpp:
[22.8.2016 21:25:08] Pursche: ///- used by eluna
sEluna->OnWorldUpdate(diff);
[22.8.2016 21:25:10] Pursche: This exists twice
[22.8.2016 21:25:18] Pursche: In the update function.

[22.8.2016 22:56:05] Rochet2: nah, seems me and salja both added it
[22.8.2016 22:56:33] Rochet2: https://github.com/ElunaLuaEngine/ElunaMangosTbc/commit/8fc0e13a356b75c91401463afea58eae9d310b9a
https://github.com/ElunaLuaEngine/ElunaMangosTbc/commit/57a872c453b35f1a514593520a2166e92e3bdec8
[22.8.2016 22:56:42] Rochet2: if you look for OnWorldUpdate

[Rochet2]

Fixed on:

• mangos zero mangoszero/server@6c9cc76
• mangos one Eluna update version - Fix duplicate timer update mangosone/server#57
• mangos two Eluna update version - Fix duplicate timer update mangostwo/server#141
• mangos three - none yet
• cmangos - fixed on all (0,1,2)