Revise 12.1-3-fail-1 to demonstrate conflict between `<table role="grid">` and `<td role="cell">`

[drewnielson]

Hold issue pending resolution of Baseline issue: atbcb/ICTTestingBaseline#345 (comment)

Demonstrate conflict between grid and cell where <td> should have role="gridcell" instead of role="cell".

[KMSOC]

https://github.com/Section508Coordinators/baselinealignment/pull/175