[css-transforms-2] Set group template to fxtf rather than CSSWG, to match transforms 1.

Author: dbaron

css-transforms-2/Overview.bs

@@ -4,7 +4,7 @@ Shortname: css-transforms
 Level: 1
 Status: ED
 Work Status: Exploring
-Group: CSSWG
+Group: fxtf
 ED: https://drafts.csswg.org/css-transforms-2/
 Editor: Tab Atkins Jr., Google Inc http://google.com, http://xanthir.com/contact/
 Editor: Simon Fraser, Apple Inc http://www.apple.com/, simon.fraser@apple.com