Repro steps:
1. Open Scene1 from the attached project
2. In the scene view, observe how the particle system is receiving shadows.
3. In the inspector, look into the particle system's renderer
4. Observe how "Receive Shadows" is ticked off.

Expected outcome:
- "Receive shadows" to be ticked on when in deferred.

Notes:
- not a regression, happens in 2017.1, 2017.2, 2017.3 and 2018.1
- besides having the box ticked in deferred, it might be helpful to have an inspector message akin to the Mesh Renderer's.