fix variable naming

[CaroAMN]

PR checklist

• This comment contains a description of changes (with reason).
• If you've fixed a bug or added code that should be tested, add tests!
• If you've added a new tool - have you followed the pipeline conventions in the contribution docs
• If necessary, also make a PR on the nf-core/lsmquant branch on the nf-core/test-datasets repository.
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• Ensure the test suite passes (nextflow run . -profile test,docker --outdir <OUTDIR>).
• Check for unexpected warnings in debug mode (nextflow run . -profile debug,test,docker --outdir <OUTDIR>).
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• Output Documentation in docs/output.md is updated.
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  fix for :

ERROR    Command 'nextflow inspect -format json -profile                        
         singularity,test,test_full                                             
         /home/runner/work/lsmquant/lsmquant/lsmquant/dev/main.nf' returned     
         non-zero error code '1':                                               
         >                                                                      
         Error workflows/lsmquant.nf:137:26: `img_dir` is already declared      
         │ 137 |             .map { meta, img_dir, parameter_file, stitched_data
         ->                                                                     
         ╰     |                          ^^^^^^^                               
                                                                                
                                                                                
         ERROR ~ Script compilation failed   

in : #61

[nf-core-bot]

Warning

Newer version of the nf-core template is available.

Your pipeline is using an old version of the nf-core template: 3.5.2.
Please update your pipeline to the latest version.

For more documentation on how to update your pipeline, please see the nf-core documentation and Synchronisation documentation.

[piplus2]

I'd suggest to use a consistent naming :)

[piplus2]

LGTM! Well done 🚀