it's just a warming filter it seems, I know you want the "official snapchat filter" in your photoshop presets, but unfortunately you're not going to find that intellectual property. I would suggest looking through other presets such as some instagram presets to find one that warms the photo and adjusts the saturation and brightness close to the filter in snapchat you like. from the research I've done snapchat filters are constantly changing, and you cannot find names for any of the filters to even have a starting point of what to look for. even if you did you would never truly find the exact filter.

I suggest taking a photo with your cellphone, and sending it to your computer to try out filters on, while also having it loaded into snapchat, with the filter you like placed on the original photo, that way you have something to reference to the presets you're trying out to find the closest option.

just remember you will be searching for presets, and a lot are paid, but you can still find quite a few free ones.