Description of problem:
When the user is changing the default project in the user preferences on a small screen (height < 700 pixels), the menu overlaps the scrollbar area and it can happens that up to three scrollbars was shown. One in the menu, and two for the content area.

Version-Release number of selected component (if applicable):
4.9 and 4.10

4.9 uses a PatternFly Select element while 4.10 uses now a shared Menu component (see https://github.com/openshift/console/pull/10277). Found this while reviewing this PR, but it happen before and after this change so that we decided to fix this as follow up.

How reproducible:
Always

Steps to Reproduce:
1. Reduce your browser window size, esp. the height to ~600 pixels
2. Click on the username in the top right corner and open "User Preferences"
3. Click on the Project to open the dropdown/select/menu

Actual results:
There are multiple scrollbars shown, scrolling feels wired

Expected results:
The scrollbar in the menu is fine, and maybe also one at the content area, but the second one at the content area should not be shown.

Additional info:
None