share: fix typo to drop 'shared' requirement on unshare

This must be a typo and it seems correct to drop the requirement since the
repo is no longer a shared repository.

hgext/share.py

@@ -116,7 +116,7 b' def unshare(ui, repo):'
         sharefile = repo.join('sharedpath')
         util.rename(sharefile, sharefile + '.old')
 
-        repo.requirements.discard('sharedpath')
+        repo.requirements.discard('shared')
         repo._writerequirements()
     finally:
         destlock and destlock.release()

tests/test-share.t

@@ -114,6 +114,8 b' test unshare command'
   $ test -d .hg/store
   $ test -f .hg/sharedpath
   [1]
+  $ grep shared .hg/requires
+  [1]
   $ hg unshare
   abort: this is not a shared repo
   [255]