Fix score weight total

[smcalilly]

Overview

• Closes: #202

Notes

To fix this, we're dividing the total by the sum of the score weights.

Testing Instructions

• visit review app: https://ccfp-asset-d-fix-score--lhc8v8.herokuapp.com/
• see some project detail pages
• confirm the weight score is less than or equal to 5

[smcalilly]

used approx method here: eee5417