fix: course creation button is inactive

When using Tab to move from Org field to the
next Course number field the Org value is not saved.

Closes openedx/frontend-app-authoring#1199 for
Redwood release.

src/editors/sharedComponents/TypeaheadDropdown/index.jsx

@@ -90,7 +90,7 @@ class TypeaheadDropdown extends React.Component {
       this.setValue(opt);
       this.setState({ displayValue: opt });
     } else {
-      this.setValue('');
+      this.setValue(value);
       this.setState({ displayValue: value });
     }
   }