FOUR-7834: Changed paper reference to avoid panning errors

[TinCodes]

Issue & Reproduction Steps

1. Add a task event
2. Select the Task
3. Hold down space
4. Drag the Paper from top to bottom

Expected behavior:
The selection should not return to the initial state after dragging the container with hold-down space.

Actual behavior:
The selection returns to the initial state as if it were spinning.

Solution

• Changed the reference of the event listener from Modeler component to paper-container component in order to verify if client left the paper. This made the fix possible.

How to Test

Test the steps above

Related Tickets & Packages

• https://processmaker.atlassian.net/browse/FOUR-7834

Code Review Checklist

• I have pulled this code locally and tested it on my instance, along with any associated packages.
• This code adheres to ProcessMaker Coding Guidelines.
• This code includes a unit test or an E2E test that tests its functionality, or is covered by an existing test.
• This solution fixes the bug reported in the original ticket.
• This solution does not alter the expected output of a component in a way that would break existing Processes.
• This solution does not implement any breaking changes that would invalidate documentation or cause existing Processes to fail.
• This solution has been tested with enterprise packages that rely on its functionality and does not introduce bugs in those packages.
• This code does not duplicate functionality that already exists in the framework or in ProcessMaker.
• This ticket conforms to the PRD associated with this part of ProcessMaker.