[10769] Fixed trainer flags uses for pet trainers.

[newsbot]

<pre>m src/game/Creature.cpp
m src/game/Player.cpp
m src/shared/revision_nr.h
</pre>
<pre style='white-space:pre-wrap;width:81ex'>[10769] Fixed trainer flags uses for pet trainers.

* Not exclude trainer flags for client for pet trainers.
* Not report error for pet trianers empty spell lists.

TODO:
* Add check for redundent trainer spell data for pet trainers at server startup
* Need hide train gossip option for pet trainers, but currently without it gossip
window not open for pet trainer by some unknown reason.</pre>




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