templatefilters: inline hbisect.shortlabel()

It's pretty simple. I don't think the business logic has to be placed in
hbisect.py.

mercurial/hbisect.py

@@ -267,12 +267,6 b' def label(repo, node):'
 
     return None
 
-def shortlabel(label):
-    if label:
-        return label[0].upper()
-
-    return None
-
 def printresult(ui, repo, state, displayer, nodes, good):
     if len(nodes) == 1:
         # narrowed it down to a single revision

mercurial/templatefilters.py

@@ -14,7 +14,6 b' import time'
 from . import (
     encoding,
     error,
-    hbisect,
     node,
     pycompat,
     registrar,
@@ -343,13 +342,15 b' def short(text):'
     return text[:12]
 
 @templatefilter('shortbisect')
-def shortbisect(text):
-    """Any text. Treats `text` as a bisection status, and
+def shortbisect(label):
+    """Any text. Treats `label` as a bisection status, and
     returns a single-character representing the status (G: good, B: bad,
     S: skipped, U: untested, I: ignored). Returns single space if `text`
     is not a valid bisection status.
     """
-    return hbisect.shortlabel(text) or ' '
+    if label:
+        return label[0].upper()
+    return ' '
 
 @templatefilter('shortdate')
 def shortdate(text):