Change default update check back to disabled

[C0RD]

This reverts major@460a185

This produces a unexpected "phone-home" situation, that will also on protected systems not work due to firewalls. It should not connect to external systems if not asked for.

It was fixed in 2024 before --> major#760

Summary by Sourcery

Enhancements:

• Change the default configuration of the version check option so that update checks are opt-in instead of enabled by default.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Reverts the previous change that enabled MySQLTuner’s automatic update check by default, restoring the behavior where update checks are disabled unless explicitly requested.

Flow diagram for update check behavior based on default flag change

flowchart TD
    A[Start MySQLTuner] --> B[Parse command line options]
    B --> C{checkversion flag set?}

    C -->|Yes, user enabled| D[Perform update check]
    C -->|No, user did not enable| E[Skip update check]

    D --> F[Continue with tuning checks]
    E --> F[Continue with tuning checks]

    classDef default fill:#f9f9f9,stroke:#333,stroke-width:1px;
    class A,B,C,D,E,F default;

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File-Level Changes

Change	Details	Files
Restore the default behavior so that automatic update checking is disabled unless the user opts in.	Change the configuration of the 'checkversion' option so its default value is 0 instead of 1, meaning no update check is performed unless explicitly enabled	mysqltuner.pl

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