Update links to FXTF mercurial repository to point to new primary repository.

This links to what is now the canonical URL for this repository, avoids
a redirect, and avoids linking to a server that might go away.

For more details about the repository change, see:
  https://lists.w3.org/Archives/Public/public-fx/2014OctDec/0135.html

Author: dbaron

css-transforms/definitions-filters.xml

@@ -397,9 +397,9 @@
   <property name='flood-color' href='#FloodColorProperty'/>
   <property name='flood-opacity' href='#FloodOpacityProperty'/>
   <property name='lighting-color' href='#LightingColorProperty'/>
-  <property name='mix' href='https://dvcs.w3.org/hg/FXTF/rawfile/default/compositing/index.html#mix-shorthand'/>
-  <property name='mix-blend-mode' href='https://dvcs.w3.org/hg/FXTF/rawfile/default/compositing/index.html#mix-blend-mode'/>
-  <property name='mix-composite' href='https://dvcs.w3.org/hg/FXTF/rawfile/default/compositing/index.html#mix-composite'/>
+  <property name='mix' href='https://hg.fxtf.org/drafts/rawfile/default/compositing/index.html#mix-shorthand'/>
+  <property name='mix-blend-mode' href='https://hg.fxtf.org/drafts/rawfile/default/compositing/index.html#mix-blend-mode'/>
+  <property name='mix-composite' href='https://hg.fxtf.org/drafts/rawfile/default/compositing/index.html#mix-composite'/>
 
 
   <!-- ... interfaces ..................................................... -->