Update old script arguments --ws-external and --ws-max-connections

[PawKanarek]

Description

When you run the script ./scripts/run/subtensor.sh on the newest version, it throws the error

error: unexpected argument '--ws-external' found                                                                                                                
                                                                                                                                                                
  tip: a similar argument exists: '--rpc-external'                                                                                                              

This PR updates the parameters of the script according to info from PR #324

Related Issue(s)

PR #324

Type of Change

Removed deprecated parameter --ws-external. Changed --ws-max-connections -> --rpc-max-connections

• Bug fix (non-breaking change which fixes an issue)

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have run cargo fmt and cargo clippy to ensure my code is formatted and linted correctly
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules