plot*diagram: Don't use the `pause mouse close` workaround when an output file is specified

There is no need for the `pause mouse close` workaround, when an output file is specified.

The scripts work fine even without this conditional, so this issue is very low priority.

Look for scripts named plot*diagram in the repository. Identify the 'pause mouse close' workaround and the condition that checks for an output file. Remove the workaround when an output file is specified, ensuring the scripts still run correctly. Test the modified scripts to verify they function without the workaround.

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