Creatures endpoint return race value straight from URL

[tobiasehlert]

Creatures endpoint use the race parameter as provided in the API URL.

Example URL:
https://dev.tibiadata.com/v4/creature/DeMonS

Issue:

{
  "creature": {
    "name": "Demons",
    "race": "DeMonS",
    "image_url": "https://static.tibia.com/images/library/demon.gif",
    ...

Expected:

{
  "creature": {
    "name": "Demons",
    "race": "demon",
    "image_url": "https://static.tibia.com/images/library/demon.gif",
    ...

Following if statement will also not evaluate correct, when race is not exact string as in parsed HTML.
https://github.com/TibiaData/tibiadata-api-go/blob/f42e70fb178df7b48c065e2a41cfca06cc99a874/src/TibiaCreaturesCreature.go#L88

Suggestion:
We should probably use the race value from the static tibia image link to compare with.