.github: bug template: simplify debug info

[jtagcat]

First: pasting multi-line in to sublist is hard.
In this case, you have to indent every line with 6 spaces,
then add backticks, go to new line, remove the ordered list -.
Instead: Only placeholder needs to be replaced, and output can be pasted straight away.

Second: Remove duplicate requests:
The last command already includes info requested above.
This commit also removes those.

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