combo-box: correct the parameter name of mx_combo_box_set_active_text
combo-box: correct the parameter name of mx_combo_box_set_active_text

The parameter name should match the name of the property it is setting.

clutter-project/mx,jonnylamb/mx,jonnylamb/mx,pwithnall/mx,pwithnall/mx,clutter-project/mx,pwithnall/mx,clutter-project/mx,clutter-project/mx,jonnylamb/mx,jonnylamb/mx,pwithnall/mx