Retake screenshots for each of nerdpacks with visual modifications

[danielgolden]

Any nerdpack that has been effected by #20, #12, or #22 now has a screenshot that is out of date. Update the screenshots.

Nerdpacks where this needs to be addressed:

• [x] T-bone
• [x] 3 col
• [x] 4 col
• [x] 2x2
• [x] 3x2
• [x] 4x2