crecord: drop unused "operation" parameter from filterpatch function

mercurial/cmdutil.py

@@ -83,7 +83,7 b' def filterchunks(ui, originalhunks, usec'
         else:
             recordfn = crecordmod.chunkselector
 
-        return crecordmod.filterpatch(ui, originalhunks, recordfn, operation)
+        return crecordmod.filterpatch(ui, originalhunks, recordfn)
 
     else:
         return patch.filterpatch(ui, originalhunks, operation)

mercurial/crecord.py

@@ -440,11 +440,8 b' class uihunk(patchnode):'
     def __repr__(self):
         return '<hunk %r@%d>' % (self.filename(), self.fromline)
 
-def filterpatch(ui, chunks, chunkselector, operation=None):
+def filterpatch(ui, chunks, chunkselector):
     """interactively filter patch chunks into applied-only chunks"""
-
-    if operation is None:
-        operation = _('confirm')
     chunks = list(chunks)
     # convert chunks list into structure suitable for displaying/modifying
     # with curses.  create a list of headers only.