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

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<pre>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</pre>



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