[10198] Partly revert old changes in load instance reset time.

[newsbot]

m src/game/InstanceSaveMgr.cpp

m src/game/InstanceSaveMgr.h

m src/shared/revision_nr.h



[10198] Partly revert old changes in load instance reset time.



* Its has been added for raid/heroic instances in time adding

  support MapDifficulty.dbc. Its wrongly assign reset events

  for each instance instaed use generic event for map/difficulty pair.

  In result at this event triggering instance can be attempt resetted

  multiply time.

* Also comment this in InstanceResetEvent fields notes

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