fix(esp-modbus): Update slave.c to fix the mode in esp-modbus example (IDFGH-14059)

[kabirwbt]

There is an issue in the lines that I have changed. I think it was copied over from the enum by mistake.

Description

Semi-colon was omitted in the old code and comma as written. I have changed both the offending lines to semi-colon endings.

Related

Testing

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
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• Documentation is updated as needed.
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[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "Update slave.c to fix the mode": body's lines must not be longer than 100 characters summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

👋 Hello kabirwbt, we appreciate your contribution to this project!

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[kabirwbt]

@alisitsyn can you please see if this is valid or is my understanding wrong.