[Bordle] Letters not always colored correctly

### Affected hardware version

Bangle 2

### Your firmware version

2v12

### The bug

The letter color hints aren't always correct when the answer has duplicate letters. Please refer to the attached screenshot. Note that in row 3, the 'L' in the middle is yellow, but in fact there's only one 'L' in the correct answer ('WOOLY').

Also, sometimes in the final letter selection screen, the border color around a letter is incorrect. I haven't figured out how to reproduce it, but sometimes a letter present in the right location has a dark blue border instead of a green one. (I've seen this happen with 'E').

Regardless, Bordle is great--thanks so much for making this! BTW, I know it'd be a pain but drawing individual characters on the letter grouping screen with appropriate green, yellow, and blue background colors might improve usability even more.

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