Fix DeploymentStep disabled state styling
Fix DeploymentStep disabled state styling

This change removes unnecessary styling from disabled
deployment-step-list list item especially width setting as it causes
horizontal scrollbar to appear

Closes-Bug: 1745385
Change-Id: I449cf7e7e7094e18060c043e85f495be72f9d9ea

knowncitizen/tripleo-ui,knowncitizen/tripleo-ui,knowncitizen/tripleo-ui,knowncitizen/tripleo-ui