gdb/testsuite: use proc_with_prefix in gdb.base/attach.exp

Use proc_with_prefix for test_command_line_attach_run, as we do for
other procs.

gdb/testsuite/ChangeLog:

	* gdb.base/attach.exp (test_command_line_attach_run): Use
	proc_with_prefix.

Change-Id: I47b61bb91b6ac0570ad7556a824f874ea50c7cda
2 files changed