Add number of checkmarks vs. qr codes logic method

[helenailic]

Utilize the n_checkpoints field in the database compared to the number of points they currently have (and thus number of checkpoints they've crossed) to return how many crossed checkpoints should be checkmarks vs. qr codes

Example:
I have 60 points, which means I've crossed 3 checkpoints.
n_checkpoints = 2, meaning i've already redeemed 2 of them.
Thus, I would return 2 checkmarks, 1 qr code.