Update Sass CSS Pattern for @include

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 6.2.0 CE M3
• Fix Version/s: 6.2.0 CE M2
• Component/s: Frontend Infrastructure, Themes Infrastructure
• Labels: None

We're updating the CSS/Sass patterns in portal and plugins to add line breaks around @include statements.
The CSS properties should be sorted alphabetically, but a linebreak should separate the includes from the normal CSS properties.