Updated RegEx for less false-positives re: RemNotes

[cameronj86]

I've gotten a lot of false-positive flashcards which are a headache to resolve. I was using the stock RegEx suggestion that uses two colons: ^(.*[^\n:]{1}):{2}([^\n:]{1}.*) and I realize this can occasionally conflict with anki subdecks because Anki uses '::' to specifiy a subdeck (ie: TGT: MainDeck::SubDeck)

I ran it through ChatGPT and got a better understanding for the parts. The small edit I did was changing to '2' to a '3' in the middle of the code: ^(.*[^\n:]{1}):{3}([^\n:]{1}.*)

What this means is that flashcards require three colons ::: instead of two. That should cut down on the false-positives for me