Cleanup db check so it doesn't spam the console

[thespad]

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• I have read the contributing guideline and understand that I have made the correct modifications

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Description:

Stops the /etc/cont-init.d/50-config: line 102: warning: command substitution: ignored null byte in input spam during startup.

Also remove curl and netcat as they're on the base.

Benefits of this PR and context:

How Has This Been Tested?

Source / References:

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/bookstack/v22.09.1-pkg-e64e3215-pr-142/index.html
https://ci-tests.linuxserver.io/lspipepr/bookstack/v22.09.1-pkg-e64e3215-pr-142/shellcheck-result.xml

[nemchik]

Let's wait for #136 which touches some of the same code.

[thespad]

Let's wait for #136 which touches some of the same code.

Forgot about that PR, just had to do something similar for another container startup, so I thought I'd apply it over here too.

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[nemchik]

This can now be rebased since #136 is merged

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/bookstack/v22.11.1-pkg-9a84e426-pr-142/index.html
https://ci-tests.linuxserver.io/lspipepr/bookstack/v22.11.1-pkg-9a84e426-pr-142/shellcheck-result.xml