churn: remove redundant round()

churn: remove redundant round()

To my surprise, the int() is required.

Spotted by Mads when he reviewed D5063. Thanks!

Differential Revision: https://phab.mercurial-scm.org/D5086

--- a/hgext/churn.py	Sat Oct 13 10:09:12 2018 +0200
+++ b/hgext/churn.py	Sat Oct 13 09:47:53 2018 -0400
@@ -205,7 +205,7 @@
                                     '*' * charnum(sum(count)))
 
     def charnum(count):
-        return int(round(count * width // maxcount))
+        return int(count * width // maxcount)
 
     for name, count in rate:
         ui.write(format(name, count))