RQ-650 Dropdown bug fixed

[DhruvBachani]

Click area of dropdowns in filter modal of Rules is text only. Made it to be the whole dropdown item as mentioned in the issue.

Closes issue: #1132

📜 Summary of changes:

Moved the onclick property to the Menu Item instead of span to allow clicking on the item itself in the dropdown rather than only text.

✅ Checklist:

• Make sure linting and unit tests pass.
• No install/build warnings introduced.
• Verified UI in browser.
• For UI changes, added/updated analytics events (if applicable).
• For changes in extension's code, manually tested in Chrome and Firefox.
• For changes in extension's code, both MV2 and MV3 are covered.
• Added/updated unit tests for this change.
• Raised pull request to update corresponding documentation (if already exists).

🧪 Test instructions:

• Create a new HTTP rule
• Select filters
• Select any option from the dropdown next to Page URL

🔗 Other references:

N/A