keep-md is not needed for the test

fixup of a8525d4

Author: cderv

tests/docs/smoke-all/knitr/eng-sql.qmd

@@ -2,7 +2,6 @@
 title: cell output display wrapping for sql engine
 engine: knitr
 format: html
-keep-md: true
 filters:
   - at: pre-quarto
     path: check-output-display.lua