Update FFG-SWRPG-Dice-Roller to publish v6.4.3 and credit previous work

[henrywild]

Updated the script.json file to publish @Hannah-Eliz 's previous work, add it to both the description in script.json as well as the commented details in FFG-SWRPG-Dice-Roller.js, and fix a typo in one of the image urls.

I did not have access to @Hannah-Eliz 's roll20 ID to add that to the script.json roll20userid field, unfortunately.

[henrywild]

@Hannah-Eliz 's previous work can be found at #2133 if needed

[henrywild]

Resolves #2172

[Arcalane]

imgbox links in their current format do not work, end result will look like this;

Will need correcting to either direct links, or ones hosted somewhere else.

I realize I'm repeating this from the issue but I want to make sure it's not overlooked.