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

local test passed
addgroupcopy test passed
clone test passed
lowlevelcopy test passed
slicing test passed
issnapshot test passed
findsnapshot test passed