avoid interger rounding

[rikublock]

Two significant digits were lost during percentage based tpos reward calculations due to integer rounding. Should multiply first and then divide.

Problem: A reward value of 1.23456789 encoded as int (CAmount): 123456789 123456789 / 100 becomes 1234567, information about the digits '89' is lost

I also don't see overflow becoming an issue currently.

[AlexITC]

@durkmurder overall this looks reasonable, what do you think?

[Fiko1414]

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[Nexlab-One]

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