transplant: remote bundle source was not closed before deleting the fetched bundle.

It fails under win32 because "normal" opened files cannot be removed.

hgext/transplant.py

@@ -575,6 +575,7 b' def transplant(ui, repo, *revs, **opts):'
         tp.apply(repo, source, revmap, merges, opts)
     finally:
         if bundle:
+            source.close()
             os.unlink(bundle)
 
 cmdtable = {