v5 - Mastheads in full page demos are not formatted correctly

[nicolethoen]

The following demos have weird masthead formatting:

• AlertGroup
  

• http://patternfly-react-v5.surge.sh/components/notification-drawer/react-demos/basic/
  

I didn't do a full audit - I noticed the first of the full page Table demos I looked at work formatted correctly. I'm not sure if this is a wide spread issue with the dashboard wrapper or specific to those demos.