User should not be able to hit enter except on last letter

[philgresh]

Prevent user from hitting enter on mid-word inputs. Disallow hitting enter twice.

[timharding31]

I'm not sure that we need to limit the ability to hit enter mid-word, I've noticed it being helpful a couple times I noticed a typo in the beginning and went back to correct. The hitting enter twice bug appears fixed with in grid.jsx:

  const handleGuess = async (e) => {
    if (e && e.key === 'Enter') {
      let enteredInputs = [...document.getElementsByClassName('grid-item')]
        .filter(input => ([...input.classList].includes('selected-row') && input.value));
      let guess = null;
      if (enteredInputs.length === props.game.nextWord['length']) {
        guess = enteredInputs.map(input => input.value).join('');
      }
      if (guess) {
        await dispatch({
          type: 'addGuess',
          guess
        })
      }
    }
  }