Input Score: Better form validation

[mattmcfad]

Currently FE will prevent call to submit game, prevent button from displaying red

[mattmcfad]

• ###Prevent same players from being inputted
• ###Ensure Loser score is at least 2 points less than winner score
• ###Prevent Loser score from being > winner
• ###Ensure when Winner score is > 21, loser score is === (winner score - 2)