profiling: cope with configwith default value handling changes

Changeset 6ff6eb33f353 change 'configwith' behavior so that the default value is
run through the conversion function. In parallel a new user of 'configwith' got
introduced unaware of this coming behavior change. This broke profiling.

We resolve the situation by having the new conversion function cope with a
default value already using the right type.

mercurial/profiling.py

@@ -126,6 +126,8 b' def statprofile(ui, fp):'
         kwargs = {}
 
         def fraction(s):
+            if isinstance(s, (float, int)):
+                return float(s)
             if s.endswith('%'):
                 v = float(s[:-1]) / 100
             else: