Change record_full_gdb_operation_disable_set not to return a cleanup

This changes record_full_gdb_operation_disable_set to return a
scoped_restore rather than a cleanup, and fixes all the users.

ChangeLog
2017-10-03  Tom Tromey  <tom@tromey.com>

	* record-full.h (record_full_gdb_operation_disable_set): Return
	scoped_restore_tmpl<int>.
	* infrun.c (adjust_pc_after_break): Update.
	(handle_signal_stop): Update.
	* record-full.c (record_full_gdb_operation_disable_set): Return
	scoped_restore_tmpl<int>.
	(record_full_wait_1, record_full_insert_breakpoint)
	(record_full_remove_breakpoint, record_full_save)
	(record_full_goto_insn): Update.