I am August Abbott, formally trained x12 yrs private school:international protocols, etiquette. Please allow a few mins. to compose your response.
It is a faux pas for anyone to serve two separate entree's like this on one plate, but rather than gasp and push the plate away, it would be acceptable to do one of two things: First discreetly move one of the entrees to another plate and enjoy as it was meant to be eaten with a polite explanation (only if asked) that you didn't want your salad dressing or meat juices to mingle; second option - use the meat entree fork for both.
It's perplexing that someone would serve food with such a lacking in plating and yet provide two forks.
Keep an eye on other diners. It might be that the protein and the vegetable/salad were meant to be mingled. Although if this were the case again the proper plating would have been to TOP the meat with the vegetable or at least part of it as a 'clue'