Fixed flat report not working for campaign_name and camppaign_source-medium report

[AltamashShaikh]

Description:

Fixed flat report not working for campaign_name and camppaign_source-medium report Fixes: #PG-3258, #144

Review

• [ ] Functional review done
• [ ] Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done
• [ ] Wording review done
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed

[AltamashShaikh]

The changes look good. I'm not sure if I'm doing something wrong, but I still experience the issue with paging a flat names report when I check out these changes in my local.

@snake14 As discussed deploying the code on demo2 works, may be something specific in your local?