System Information
Operating system: Win 7
Graphics card: GTX 550ti
Blender Version
Broken: Blender 2.8 beta 1 hour ago build
(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Worked: (optional) Blender 2.79 latest master
Short description of error
Subtract brush missing in weight painting mode
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
I believe in case image will just do the work.

