Replace unicode fullwidth colon with a regular ascii colon. (#2001)

The PSL file format encourages ascii characters where possible to make
parsing easier. This is one comment block with metadata (contact info
etc.) that does not use an ascii colon, making parsing more difficult.

public_suffix_list.dat

@@ -13397,7 +13397,7 @@ freemyip.com
 // Submitted by Daniel A. Maierhofer <[email protected]>
 wien.funkfeuer.at
 
-// Future Versatile Group. ：https://www.fvg-on.net/
+// Future Versatile Group. : https://www.fvg-on.net/
 // T.Kabu <[email protected]>
 daemon.asia
 dix.asia