load_pw_modules: Make it no-op if no pw-cli or pipewire is not running #8
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With this change, the script exits gracefully if ever it runs on a system where pipewire is not installed or not running.
Note that 'pw-cli quit' was added in pipewire 0.3.38, so we're good since we require 0.3.58 at least.
While we're here, we also drop a stray comment (it comes from load_pa_modules.sh, however the code associated with this comment is gone, cf. 1), and we replace it by a comment to explain what the next code block does.