fix rows vector according to pyimagesearch python source code#7

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Commits on Sep 14, 2022

[#REFACTOR] change ++j and ++i expressions to i++ and j++ in calculate distances section of centroidtracker.cpp
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[#REFACTOR] defining temp_rows variable and defining sortbysec function to sort temp_rows elements according to their second element and put them in sorted order in rows vector (as it is implemente…
arashrahmani
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[#REFACTOR] change sortbysec name to sortbyfirst
arashrahmani
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