remove .json extension from filename on automatic conversion to csv when running plantcv-run-workflow

[AFis-245]

Describe the bug
When running plantcv-run-workflow the csv files that are created still include the .json extension in the name.

To Reproduce
Steps to reproduce the behavior (including sample data and code really help):

1. specify the name of the output json file in the config file: config.json = "./results/output_control.json"
2. Run plantcv-run-workflow in terminal
3. See error: this is the name it gets saved as /results/output_control.json-single-value-traits.csv

Expected behavior
A clear and concise description of what you expected to happen.

Local environment (please complete the following information):

• OS: macOS
• Environment: conda
• PlantCV Version: 4.7.dev

Additional context
Add any other context about the problem here.

[nfahlgren]

Thanks @AFis-245, does this cause an error or just to make it cleaner?

[AFis-245]

@nfahlgren It still works fine. It pretty much just looks weird, but I just manually renamed the file for now and there aren't any problems with it.