Fix markdown header toolbar showing in compact preview view
What does this MR do and why?
For all markdown editor textboxes, the compact/mobile view was showing the toolbar buttons when the Preview tab was selected, but they're supposed to be hidden. This MR fixes that.
| Before (toolbar buttons are shown) | After (toolbar buttons are hidden) |
|---|---|
 |
 |
MR acceptance checklist
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Related to #344429 (closed)