shelve: make non bare shelve not saving branch information in bundle This patch prepares for restoring newly created branch only on bare shelve later because information about new-branch will be preserved only when shelve was bare and working copy branch was different than branch of its parent. In other case information about new-branch will be gone, so unshelve will not recognise that shelve was made on new-branch and it will not restore branch information from the bundle to the working directory.