tests: test-debugcommands.t also matches stack trace on python 2.4

Some versions of python 2.4 write ? instead of <module>. Ignore this detail by
a glob.
This fixes a failure spotted on buildbot, existing since this test lines were
introduced 47d0843647d1.

tests/test-debugcommands.t

@@ -38,10 +38,10 b' Test internal debugstacktrace command'
   > EOF
   $ python debugstacktrace.py
   hello world at:
-   debugstacktrace.py:7 in <module>
+   debugstacktrace.py:7 in * (glob)
    debugstacktrace.py:5 in g
    debugstacktrace.py:3 in f
   stacktrace at:
-   debugstacktrace.py:7 *in <module> (glob)
+   debugstacktrace.py:7 *in * (glob)
    debugstacktrace.py:6 *in g (glob)
    */util.py:* in debugstacktrace (glob)