Initialise the IDE updater even when 'checkForUpdates' preference is false

[AlbyIanna]

Motivation

"Check for Arduino IDE Updates" operation fails when automatic update checks are disabled #1437

The reason is that we're avoiding to initialise the updater properly at start-up if the "Check for Arduino IDE Updates" preference is disabled.

Change description

Always initialise the updater. Only then we can decide if effectively check for updates or not.

Other information

Reviewer checklist

• [ ] PR addresses a single concern.
• [ ] The PR has no duplicates (please search among the Pull Requests before creating one)
• [ ] PR title and description are properly filled.
• [ ] Docs have been added / updated (for bug fixes / features)