Fix consecutive-wins bug in solution

[XueyanZhang]

Problem

runner.consecutive_wins += 1

consecutive_wins is never initialized.
The first time the player guesses correctly, the reference solution
crashes with:

AttributeError: 'GameRunner' object has no attribute 'consecutive_wins'

Fix

• Track consecutive wins with a local consecutive_wins variable in
  run() (initialized to 0), removing the broken instance attribute.
• Roll the dice each round so the game state actually changes between
  rounds. (I'm not sure if not re-rolling is intentional — happy to revert this if so.)