Change grid corners to be team colors

[crkellen]

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Type of Issue

• [ ] This Issue is a Bug
• [ ] This Issue is a Feature Request
• [x] This Issue is a Design Issue/Request

Hint: Design Issues or Requests are changes to existing features, not new ones.

Description of the Issue:

Whatever size that the bases will be, change those grid tiles to be that color, since the bases never move, this is a good way of user feedback of where the base is.

Additional comments or information:

[crkellen]

This has been temporarily modified while awaiting a more permanent change