Update igenomes config

[nictru]

I updated the igenomes config because there were some issues concerning null values when using igenomes, probably because some of the attributes were missing in the old version

There are some other things fixed:

• Version dumping failed because of unexpected indentation
• Pipeline parameters were overwritten by the default values when set via igenomes
• Linting errors

[nictru]

I figured out that removing the gtf default value was not the smartest idea, since the nf-core linting is failing now. I'll have a second look at this.

[maxulysse]

I feel that you have a template update at the same time.
Can you have a look at #78 before?

[nictru]

Thanks for the hint @maxulysse. I rebased #78 so that we can merge that one first.

[maxulysse]

Thanks for the hint @maxulysse. I rebased #78 so that we can merge that one first.

sorry, read the other PR before...
Figured you wanted to merge #78 and then use #77 to fix the tests, not the other way around..

🤦

[nictru]

Finally everything should be ready now.

[FriederikeHanssen]

Nice work!