keyword: use `set_clean` instead of `normal`

This is the newer, more semantic API.

Differential Revision: https://phab.mercurial-scm.org/D11153

hgext/keyword.py

@@ -356,7 +356,7 b' class kwtemplater(object):'
                 fp.write(data)
                 fp.close()
                 if kwcmd:
-                    self.repo.dirstate.normal(f)
+                    self.repo.dirstate.set_clean(f)
                 elif self.postcommit:
                     self.repo.dirstate.normallookup(f)