Allow ModeSelect with page code 1

OpenVMS Alpha (the operating system, not the SRM BIOS) uses
ModeSelect6 with a page code of 1.

The semantics are unknown, just accepting it works for me.

Signed-off-by: Klaus Kämpf <kkaempf@gmail.com>

cpp/devices/scsi_command_util.cpp

@@ -63,6 +63,10 @@ string scsi_command_util::ModeSelect(scsi_command cmd, cdb_t cdb, span<const uin
 
 			has_valid_page_code = true;
 		}
+		else if (page == 0x01) {
+			// OpenVMS Alpha 7.3 uses this
+			has_valid_page_code = true;
+		}
 		else {
 			stringstream s;
 			s << "Unknown MODE SELECT page code: $" << setfill('0') << setw(2) << hex << page;