Studying in the UK for a Master's degree, still worth it?
Brexit will not affect the quality of the education you receive from UK universities, at least in the short term. (Longer term things are not clear, as it may become harder for UK universities to recruit faculty.) That is the main factor you should consider.

Potentially the exchange rate will make it cheaper (measured in euros) to live in the UK. Potentially it will be harder and/or less desirable to get a job in the UK after graduation. However, I can only speculate about such other factors and this is not the right place to discuss them.