patch 9.0.0895: file renamed twice in test, missing feature check

Problem:    File renamed twice in test; missing feature check.
Solution:   Remove a rename() call.  Add check for cryptv feature.
            (closes #11564)
diff --git a/src/testdir/test_recover.vim b/src/testdir/test_recover.vim
index cb34c64..395eb06 100644
--- a/src/testdir/test_recover.vim
+++ b/src/testdir/test_recover.vim
@@ -121,7 +121,6 @@
   call test_override("uptime", 0)
   sleep 1
 
-  call rename('Xswap', swname)
   call feedkeys('e', 'tL')
   redir => editOutput
   edit Xswaptest
@@ -322,6 +321,7 @@
 
 " Test for :recover using an encrypted swap file
 func Test_recover_encrypted_swap_file()
+  CheckFeature cryptv
   CheckUnix
 
   " Recover an encrypted file from the swap file without the original file