CLI tool: ANSI colors cause output to be greyed out on Mac

[tadeohepperle]

In this PR @jsdw mentioned, that the colors are getting greyed out after certain blocks:

This is likely an issue with the interpretation of ANSI escape codes used by owo_colors. We could not reproduce it on non-mac machines. Should be investigated more.

[niklasad1]

@jsdw can you try the owo_colors crate and see whether we can open an issue in owo_colors if it's mac issue?

I looked briefly in the issue tracker and couldn't find any mac specific issue there

[jsdw]

Note: to reproduce this:

0. Might only be an issue on a mac
1. Run a polkadot dev node in a terminal: polkadot --dev
2. In another terminal, and in the subxt repo root, run cargo run --bin subxt -- explore pallet balances calls transfer_allow_death.

Does the colour output seem weird as in the above (turns grey)?