tests: use ls -A instead of ls -1 in test-removeemptydirs.t

In case the tests are run as root, ls assumes -A by default on some systems
(e.g. NetBSD). Tests probably shouldn't be run as root, but let's use -A just
in case, for convenience.

tests/test-removeemptydirs.t

@@ -134,7 +134,8 b' Windows is not affected'
   $ hg $DO_RM --config extensions.histedit= histedit -q --commands ../histedit_commands
   current directory was removed (no-windows !)
   (consider changing to repo root: $TESTTMP/hghistedit) (no-windows !)
-  $ ls -1 $TESTTMP/hghistedit/
+  $ ls -A $TESTTMP/hghistedit/
+  .hg
   histedit_commands
   r0
   r1
@@ -149,9 +150,9 b' Windows is not affected'
   $ "$PYTHON" "$TESTTMP/pwd.py"
   <directory is no longer accessible>
 #endif
-  $ ls -1 $TESTTMP/hghistedit/somedir
+  $ ls -A $TESTTMP/hghistedit/somedir
   foo
-  $ ls -1
+  $ ls -A
   foo (windows !)
 
 Get out of the doomed directory