Fix create new params file dialog box; add CTRL_MAX to v6.8 PID converter.
Fix create new params file dialog box; add CTRL_MAX to v6.8 PID converter.

AutoQuad/qgroundcontrol_aq,AutoQuad/qgroundcontrol_aq,hejunbok/qgroundcontrol_aq,AutoQuad/qgroundcontrol_aq,AutoQuad/qgroundcontrol_aq,hejunbok/qgroundcontrol_aq,hejunbok/qgroundcontrol_aq,hejunbok/qgroundcontrol_aq