[10460] Fixed unexpected area aura stacking from same caster at spellmods reapply.

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<pre>m src/game/Unit.cpp
m src/shared/revision_nr.h
</pre>
<pre style='white-space:pre-wrap;width:81ex'>[10460] Fixed unexpected area aura stacking from same caster at spellmods reapply.

In fact it general problem possible with area auras if it re-casted
non-standard way from code. But known only test case for mangos-0.12 branch.

Thanks to ciphercom for reportand original research of problem source.</pre>




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