tests: backout a82de9dc4f77, debugstacktrace is now stable, drop workaround

tests/test-debugcommands.t

@@ -1,48 +1,47 b''
   $ hg init debugrevlog
   $ cd debugrevlog
   $ echo a > a
   $ hg ci -Am adda
   adding a
   $ hg debugrevlog -m
   format : 1
   flags  : inline
   
   revisions     :  1
       merges    :  0 ( 0.00%)
       normal    :  1 (100.00%)
   revisions     :  1
       full      :  1 (100.00%)
       deltas    :  0 ( 0.00%)
   revision size : 44
       full      : 44 (100.00%)
       deltas    :  0 ( 0.00%)
   
   avg chain length  : 0
   compression ratio : 0
   
   uncompressed data size (min/max/avg) : 43 / 43 / 43
   full revision size (min/max/avg)     : 44 / 44 / 44
   delta size (min/max/avg)             : 0 / 0 / 0
 
 
 Test internal debugstacktrace command
 
   $ cat > debugstacktrace.py << EOF
   > from mercurial.util import debugstacktrace, dst, sys
   > def f():
   >     dst('hello world')
   > def g():
   >     f()
-  >     sys.stderr.flush()
   >     debugstacktrace(skip=-5, f=sys.stdout)
   > g()
   > EOF
   $ python debugstacktrace.py
   hello world at:
-   debugstacktrace.py:8 in * (glob)
+   debugstacktrace.py:7 in * (glob)
    debugstacktrace.py:5 in g
    debugstacktrace.py:3 in f
   stacktrace at:
-   debugstacktrace.py:8 *in * (glob)
-   debugstacktrace.py:7 *in g (glob)
+   debugstacktrace.py:7 *in * (glob)
+   debugstacktrace.py:6 *in g (glob)
    */util.py:* in debugstacktrace (glob)