Wizard: Make AWS sources select scrollable in modal

There is a bug in Patternfly that causes 'pop out' selects (those that
use the menuAppendTo="parent" prop) to be rendered underneat the wizard
footer.

Until this is patched in Patternfly, we will have to live with
suboptimal select menus that scroll inside the modal.

src/Components/CreateImageWizard/formComponents/AWSSourcesSelect.js

@@ -78,8 +78,6 @@ export const AWSSourcesSelect = ({
           isOpen={isOpen}
           placeholderText="Select source"
           typeAheadAriaLabel="Select source"
-          menuAppendTo="parent"
-          maxHeight="25rem"
           isDisabled={!isSuccess}
         >
           {isSuccess &&