Use proc_with_prefix in py-breakpoint.exp

Use proc_with_prefix in py-breakpoint.exp

Use proc_with_prefix to avoid having to call with_test_prefix with a
duplicate of the proc name.  The diff is mostly lines being re-indented.

gdb/testsuite/ChangeLog:

	* gdb.python/py-breakpoint.exp (test_bkpt_basic,
	test_bkpt_deletion, test_bkpt_cond_and_cmds,
	test_bkpt_invisible, test_watchpoints, test_bkpt_internal,
	test_bkpt_eval_funcs, test_bkpt_temporary, test_bkpt_address,
	test_bkpt_pending, test_bkpt_events): Use proc_with_prefix,
	remove with_test_prefix.