Merge branch 'ps/receive-pack-updateinstead-in-worktree'

The check in "receive-pack" to prevent a checked out branch from getting updated via updateInstead mechanism has been corrected. * ps/receive-pack-updateinstead-in-worktree: receive-pack: use worktree HEAD for updateInstead t5516: clean up cloned and new-wt in denyCurrentBranch and worktrees test t5516: test updateInstead with worktree and unborn bare HEAD