Fix debugger stripping content it shouldn't

[DL6ER]

By submitting this pull request, I confirm the following:

• I have read and understood the contributors guide, as well as this entire template.
• I have made only one major change in my proposed changes.
• I have commented my proposed changes within the code.
• I have tested my proposed changes, and have included unit tests where possible.
• I am willing to help maintain this change if there are issues with it later.
• I give this submission freely and claim no ownership.
• It is compatible with the EUPL 1.2 license
• I have squashed any insignificant commits. (git rebase)

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What does this PR aim to accomplish?:

Strip only lines starting with a #. Do not silently truncate lines if they have a # somewhere in between (like server=127.0.0.1#5353).

How does this PR accomplish the above?:

Fix an imprecise sed command.

Real content:

server=127.0.0.1#5353

pihole -d now:

server=127.0.0.1  <---- [the rest of the line is silently truncated !]

pihole -d with this fix:

server=127.0.0.1#5353

Lines starting with # ("real comments") are still silently skipped

What documentation changes (if any) are needed to support this PR?:

None

[DL6ER]

Travis - Branch didn't pick up the branch at all.

As Travis - PR reports ✔️ we should be good to go.

[PromoFaux]

Cool, update the release notes ;) (and the blog draft)

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-core-web-v5-2-1-and-ftl-v5-3-2-released/41148/1