[Bugfix] Correct table rendering

[ddbaptiste]

What does this PR do?

This PR fixes an issue identified today in table rendering when there's an explicit header.

Example Quarto source:

| Drug Behavior | Proportion in 2018 | Proportion in 2022 |
|---------------|--------------------|--------------------|
| Former IDU    | 0.021056150        | 0.021111893        |
| Current IDU   | 0.005124777        | 0.005043397        |
| Never         | 0.973819073        | 0.973844710        |
: Drug Behavior Proportions {#tbl-behavior-prop1 tbl-colwidths=\["50, 50"\]}

What Wrike task is this associated with?

https://www.wrike.com/open.htm?id=4356639222