tests: update test-debugcommands.t stack trace checks for python3.9

Python 3.9 prints a complete filepath in more cases, so we need to handle that
in our test output. Since we don't really care *that* much about the specific
path formatting here, just use globbing.

Differential Revision: https://phab.mercurial-scm.org/D8329

tests/test-debugcommands.t

@@ -588,15 +588,15 b' Test internal debugstacktrace command'
   > EOF
   $ "$PYTHON" debugstacktrace.py
   stacktrace at:
-   debugstacktrace.py:14 in * (glob)
-   debugstacktrace.py:7  in f
+   *debugstacktrace.py:14 in * (glob)
+   *debugstacktrace.py:7  in f (glob)
   hello from g at:
-   debugstacktrace.py:14 in * (glob)
-   debugstacktrace.py:8  in f
+   *debugstacktrace.py:14 in * (glob)
+   *debugstacktrace.py:8  in f (glob)
   hi ...
   from h hidden in g at:
-   debugstacktrace.py:8  in f
-   debugstacktrace.py:11 in g
+   *debugstacktrace.py:8  in f (glob)
+   *debugstacktrace.py:11 in g (glob)
 
 Test debugcapabilities command: