lfs: don't add extension to hgrc after conversion (BC)

This is in the spirit of bcf72d7b1524.

hgext/lfs/wrapper.py

@@ -213,10 +213,6 b' def convertsink(orig, sink):'
                         self.repo.requirements.add('lfs')
                         self.repo._writerequirements()
 
-                        # Permanently enable lfs locally
-                        self.repo.vfs.append(
-                            'hgrc', util.tonativeeol('\n[extensions]\nlfs=\n'))
-
                 return node
 
         sink.__class__ = lfssink

tests/test-lfs-largefiles.t

@@ -286,8 +286,7 b' parameters are available, but not --auth'
   0 remove large_by_size.bin
   $ cd nolargefiles
 
-The requirement is added to the destination repo, and the extension is enabled
-locally.
+The requirement is added to the destination repo.
 
   $ cat .hg/requires
   dotencode
@@ -296,8 +295,6 b' locally.'
   lfs
   revlogv1
   store
-  $ hg config --debug extensions | grep lfs
-  $TESTTMP/nolargefiles/.hg/hgrc:*: extensions.lfs= (glob)
 
   $ hg log -r 'all()' -G -T '{rev} {join(lfs_files, ", ")} ({desc})\n'
   o  8 large_by_size.bin (remove large_by_size.bin)

tests/test-lfs.t

@@ -1030,9 +1030,6 b' This convert is trickier, because it con'
   size 39
   x-is-binary 0
 
-  $ hg -R convert_lfs2 config --debug extensions | grep lfs
-  $TESTTMP/convert_lfs2/.hg/hgrc:*: extensions.lfs= (glob)
-
 Committing deleted files works:
 
   $ hg init $TESTTMP/repo-del