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.)

[leespen1]

This pull request correctly changes the uninitialized runner.consecutive_wins to a function-local variable so that the program does not crash, and changes count to consecutive_wins so there is no redundancy (count is used to keep track of the number of consecutive wins).

This pull request also re-rolls the dice each round, so that the answer is not the same every time.