Fix: Default values for updateChannelPolicyCommand

[nettijoe96]

Change Description

• Shows the correct default instead of (defaults: 0) for flags that have a default value.
• If flag not provided, ctx.IsSet() will send 0 to the RPC

fixes #1523

Steps to Test

Run updateChannelPolicyCommand command with -h and see defaults.

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[guggero]

Thanks for the PR. I have to say, you're quite brave to tackle this issue... Many have tried before 😅 To avoid a lot of back-and-forth while reviewing, please make sure you have read all previous discussions in #6762 and understand the nuance of what a default value is, where it's shown, how it's used and what user expectations (and the server behavior) are around those flags.

Also, please make sure commits are logical units that tell the reviewer what is happening, why and in what order. So multiple edits of the same line should usually be squashed into a single commit.

[nettijoe96]

I've studied the previous attempts and unfortunately I think there is going to be some minor back and forth.

I added a comment here #6762 (comment)

Good catch on the commits, I'll squash it into a single commit