adjust displayed bid price to account for custom granularity

[shanakatz]

When displaying the bid CPM values for each bidder, the tool doesn't take the specific price granularity in use into consideration - it appears to be pulling raw bid responses. This can be a bit misleading, especially if the bid wins in GAM since it technically did not win at the CPM displayed (and doesn't match the key-values used).
This is the case for both organic bids and bids simulated using the toolset.