In dash interp jobs -r is not supported, so cutting it off

[sparshev]

Not important small fix, because dash doesn't really like jobs -r. Also if we will use only -p - it will display the same pid's even when they are completed.

Related Issue

None

Motivation and Context

Fun for sure

How Has This Been Tested?

Manually

Types of changes

• 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)

Checklist:

• I have signed the Adobe Open Source CLA.
• 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 document.
• I have added tests to cover my changes.
• All new and existing tests passed.