[9929] Move apply spell coeffs and level penalties code to new function.

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m src/game/Unit.cpp

m src/game/Unit.h

m src/shared/revision_nr.h



[9929] Move apply spell coeffs and level penalties code to new function.



* No reson have 6 copies near to exactly same code.



* This fix problem with apply attack power bonus in some case.

  Thanks to Wowka321 for find and reseach problem.

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