fix(app-243): Simplify copy in auto-create proposals for OSx updates

[evanaronson]

Description

Upgrading a plugin with no metadata will show a null in the proposal description. Fixed by removing that part of the string.

Type of Change

• 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 not work as expected)

Developer Checklist:

• Manually smoke tested the functionality locally (https://app-next-5dn4xoewn-aragon-app.vercel.app/dao/ethereum-sepolia/0x569fB583D896645475aE0D909D15Bc612F43450F/proposals/MULTISIG-14)
• Confirmed there are no new warnings or errors in the browser console
• (For User Stories only) Double-checked that all Acceptance Criteria are satisfied
• Confirmed there are no new warnings on automated tests
• Merged and published any dependent changes in downstream modules
• Selected the correct base branch
• Commented the code in hard-to-understand areas
• Followed the code style guidelines of this project
• Reviewed that the Files Changed in Github’s UI reflect my intended changes
• Confirmed the pipeline checks are not failing

Review Checklist:

• Tested locally that all Acceptance Criteria or Expected Outcomes are satisfied
• Confirmed that changes follow the code style guidelines of this project

[linear]

APP-243 Upgrading a plugin with no metadata will show a null in the proposal description [REMOVE FROM STRING]

[github-actions]

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