templates: shorten definition of changeset labels in command-line style

We'll add more labels and the line is already quite long, so let's define a
variable to hold all evolution "troubles" labels.

mercurial/templates/map-cmdline.default

@@ -29,7 +29,8 b" lfile_copies_switch = '{if(file_copies_s"
 
 # General templates
 _trouble_label = 'trouble.{trouble}'
-_cset_labels = '{separate(" ", "log.changeset", "changeset.{phase}", "{if(troubles, "changeset.troubled {troubles%_trouble_label}")}")}'
+_troubles_labels = '{if(troubles, "changeset.troubled {troubles%_trouble_label}")}'
+_cset_labels = '{separate(" ", "log.changeset", "changeset.{phase}", "{_troubles_labels}")}'
 cset = '{label("{_cset_labels}",
                "changeset:   {rev}:{node|short}")}\n'