Removes whitespace at start of inline QSD textarea

This caused Markdown rendering problems when the QSD was edited and then
saved without removing the whitespace first.
Fixes Markdown issues in default inline QSD

Improvement to 9c04172a6c42c67eff2a40b5d6a85aad4f22fba6 that applies
lstrip() to all lines of the QSD content, to avoid Markdown code blocks
in the middle of a QSD.
Merge pull request #1028 from learning-unlimited/inline-qsd-fixes

Inline qsd fixes