[binutils-gdb] Fix mi-pending.exp test output to allow stable test diffing

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT ad235a410aebf08ca67589891388774aa1d03562 ***

Author: Antoine Tremblay <antoine.tremblay@ericsson.com>
Branch: master
Commit: ad235a410aebf08ca67589891388774aa1d03562

Fix mi-pending.exp test output to allow stable test diffing
gdb/testsuite/ChangeLog:

	* gdb.mi/mi-pending.exp: Fix output of breakpoint test.