tests: drop an extraneous (glob) from test-debugbackupbundle.t
Since this was not needed, it ends up causing the test to end with an error
saying that the output changed, but with no diff and a message at the end saying
"no result code from test".
Differential Revision: https://phab.mercurial-scm.org/D8269
$ hg init
$ touch unknown
$ touch a
$ hg add a
$ hg ci -m "1"
$ touch b
$ hg add b
$ hg ci -m "2"
Should show unknown
$ hg status
? unknown
$ hg revert -r 0 --all
removing b
Should show unknown and b removed
$ hg status
R b
? unknown
Should show a and unknown
$ ls
a
unknown