When trying to produce a PDF via ConTeXt I get an "undefined control sequence" error associated with the line: `\KOMAoptions{captions}{tableheading}`.

I don't really know what KOMAoptions are, but a google search suggests it's associated with a LaTeX macro package. Maybe this `header-includes` should only be used when LaTeX is the `pdf-engine`?

```bash
$ quarto --version
0.9.86
$ context --version
mtx-context     | ConTeXt Process Management 1.04
mtx-context     |
mtx-context     | main context file: ${HOME}/context/tex/texmf-context/tex/context/base/mkiv/context.mkiv
mtx-context     | current version: 2022.01.21 20:13
mtx-context     | main context file: ${HOME}/context/tex/texmf-context/tex/context/base/mkxl/context.mkxl
mtx-context     | current version: 2022.01.21 20:13
```

Example qmd:

```markdown
---
title: "Test"
format:
  pdf:
    pdf-engine: context
---

# Introduction

Rendering this document yields an error on line 63, which is 
`\KOMAoptions{captions}{tableheading}`
```

Render:

```bash
$ quarto render README.qmd --to pdf
pandoc 
  to: pdf
  output-file: README.pdf
  standalone: true
  pdf-engine: context
  variables:
    graphics: true
    tables: true
  default-image-extension: pdf
  filters:
    - crossref
  
metadata
  documentclass: scrartcl
  classoption:
    - DIV=11
    - numbers=noendperiod
  papersize: letter
  header-includes:
    - '\KOMAoption{captions}{tableheading}'
  title: Test
  
Error producing PDF.
tex error       > tex error on line 63 in file ./input.tex: Undefined control sequence \undefined 
```
2022-03-13T17:55:55Z
cswingle
closed
ConTeXt pdf-engine fails on KOMAoptions
https://github.com/quarto-dev/quarto-cli/issues/412