This is still happening in 2018.1.0a5

Repo
1. Open 2018.1.0a5
2. Head to the Asset Store and download Tanks! Example project
3. Run the _Complete-Game scene found under Assets
4. Try to move the tanks using W,S,A,D
Notice issue >> Tanks do not move console is spammed with errors.

ArgumentException: Input Axis HorizontalUI is not setup.
To change the input settings use: Edit > project settings > input.

*Note :
Works fine in 2018.1.a3.

Stack Trace:
ArgumentException: Input Axis HorizontalUI is not setup.
To change the input settings use: Edit -> Project Settings -> Input
UnityEngine.EventSystems.BaseInput.GetAxisRaw (System.String axisName) (at /Users/builduser/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/InputModules/BaseInput.cs:69)
UnityEngine.EventSystems.StandaloneInputModule.ShouldActivateModule () (at /Users/builduser/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/InputModules/StandaloneInputModule.cs:161)
UnityEngine.EventSystems.EventSystem.Update () (at /Users/builduser/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/EventSystem.cs:267)