tests: glob 'mercurial.error' in test-phases.t

On python 2 with chg, `mercurial.error` is omitted while printing error. On
other cases it's there in error message.

I did tried to understand what might be the cause was unable to find one on
quick skim through the code.

tests/test-phases.t

@@ -896,13 +896,11 b' Check we deny its usage on older reposit'
   $ hg --config "phases.new-commit=internal" commit -m "my test internal commit" 2>&1 | grep ProgrammingError
   ** ProgrammingError: this repository does not support the internal phase
       raise error.ProgrammingError(msg)
-  mercurial.error.ProgrammingError: this repository does not support the internal phase (no-chg !)
-  ProgrammingError: this repository does not support the internal phase (chg !)
+  *ProgrammingError: this repository does not support the internal phase (glob)
   $ hg --config "phases.new-commit=archived" commit -m "my test archived commit" 2>&1 | grep ProgrammingError
   ** ProgrammingError: this repository does not support the archived phase
       raise error.ProgrammingError(msg)
-  mercurial.error.ProgrammingError: this repository does not support the archived phase (no-chg !)
-  ProgrammingError: this repository does not support the archived phase (chg !)
+  *ProgrammingError: this repository does not support the archived phase (glob)
 
   $ cd ..