update.sh: remove unnecessary rm operation

[sxa]

Description

This change was added in https://github.com/nodejs/docker-node/pull/757/changes but I can't see any reason why this piece of code would be executed. The sed command used includes -i which isn't a POSIX standard operation and this code appears to be removing a temporary file that is never actually created because of the use of -i.

Would be good if someone on a mac could verify this since that seems to be the platform that resulted in the -e parameter being added.

Motivation and Context

Testing Details

I've ran update.sh and no -tmp-e files were left behind

Example Output(if appropriate)

Types of changes

• Documentation
• Version change (Update, remove or add more Node.js versions)
• Variant change (Update, remove or add more variants, or versions of variants)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (none of the above) - obsolete code

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING.md document.
• All new and existing tests passed.

[sxa]

I can't explicitly add reviewers so tagging @PeterDaveHello who did the referenced PR that introduced these lines.