largefiles: don't use 'r' action for normal file that doesn't exist

When merging and the remote has turned a largefile into a normal file
and the user chooses to keep the local largefile, we use the 'r'
action for the remote normal file. This is wrong, since that file does
not exist in the parent of the working copy. Use 'k', which does
nothing but debug logging, instead.

hgext/largefiles/overrides.py

@@ -456,7 +456,7 b' def overridecalculateupdates(origfn, rep'
             if repo.ui.promptchoice(usermsg, 0) == 0: # keep local largefile
                 if branchmerge:
                     # largefile can be restored from standin safely
-                    actions['r'].append((lfile, None, 'replaced by standin'))
+                    actions['k'].append((lfile, None, 'replaced by standin'))
                 else:
                     # "lfile" should be marked as "removed" without
                     # removal of itself

tests/test-issue3084.t

@@ -116,8 +116,8 b' Largefile in the working copy, keeping t'
   remote turned local largefile foo into a normal file
   keep (l)argefile or use (n)ormal file? l
   getting changed largefiles
-  1 largefiles updated, 0 removed
-  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  0 largefiles updated, 0 removed
+  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
 
   $ hg status
@@ -329,8 +329,8 b' swap'
   remote turned local largefile f into a normal file
   keep (l)argefile or use (n)ormal file? l
   getting changed largefiles
-  1 largefiles updated, 0 removed
-  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  0 largefiles updated, 0 removed
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   $ cat f
   large
@@ -409,8 +409,8 b' Ancestor: large Parent: large2 Paren'
   remote turned local largefile f into a normal file
   keep (l)argefile or use (n)ormal file? l
   getting changed largefiles
-  1 largefiles updated, 0 removed
-  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  0 largefiles updated, 0 removed
+  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   $ cat f
   large2