git: fix wrong value used when migrating user inputValidation setting

[yogeshwaran-c]

When migrating the legacy string-based git.inputValidation setting to the new boolean form, the user (global) setting migration incorrectly read workspaceValue instead of globalValue to compute the new boolean.

This meant that if someone had a workspace setting but not a user setting, the migration would still run (since globalValue is checked for the typeof guard), but would use the workspace value instead of the user value, producing incorrect results.

Before:

// User setting
if (typeof inputValidation.globalValue === string) {
    await config.update(inputValidation, inputValidation.workspaceValue !== off, true);
}

After:

// User setting
if (typeof inputValidation.globalValue === string) {
    await config.update(inputValidation, inputValidation.globalValue !== off, true);
}

Fixes the copy-paste mistake introduced in the migration helper.

[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

@lszomoru

Matched files:

• extensions/git/src/diagnostics.ts