add --force parameter to modules remove and subworkflow remove

[mashehu]

We already hint to use it to ignore left over include statements. Now this actually allows that.

Also found a bug where include statements where not found for non-standard workflow directory structures, for example in workflows/rnaseq/main.nf

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.14%. Comparing base (0e87eb7) to head (ae7e150).
⚠️ Report is 6 commits behind head on dev.

Files with missing lines	Patch %	Lines
nf_core/__main__.py	66.66%	2 Missing ⚠️
nf_core/commands_modules.py	50.00%	1 Missing ⚠️
nf_core/commands_subworkflows.py	50.00%	1 Missing ⚠️

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[pinin4fjords]

just a typo