Use curly braces in if condition

[glenthomas]

Why:

GitHub lint says it's strongly recommended to always wrap the full if: condition in ${{ }}. I think it would be best to include this in the example code to avoid leading people into unexpected issues.

See the GH-Lint documentation for an explanation.

What's being changed (if available, include any code snippets, screenshots, or gifs):

Add braces to if.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Pull Request Overview

This PR updates a GitHub Actions workflow example to follow best practices by wrapping the if condition in curly braces syntax as recommended by GitHub lint.

• Added ${{ }} wrapper around the if condition to align with GitHub's strongly recommended practices

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Source	Review	Production	What Changed
actions/how-tos/write-workflows/choose-when-workflows-run/control-jobs-with-conditions.md	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Sharra-writes]

@glenthomas Looks right to me! I didn't even know it was possible to do an if conditional without curly brackets, so I'm going to go ahead and get this approved.

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