fix(gnodev): fix the use of filepath instead of path on windows

[gfanton]

fix #3722

Using filepath to work with the path creates some obvious issues on Windows, primarily because the Clean function replaces / with \\. This PR updates the usage of filepath to path where necessary.

At some point, adapting path-specific tests on Windows would be very helpful.

---

@Milosevic02, can you confirm that this fix resolves most of your issues with gnodev?

EDIT: It seems that the fix is effective: #3722 (comment)

[Gno2D2]

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Codecov Report

Attention: Patch coverage is 89.65517% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
contribs/gnodev/pkg/packages/loader_glob.go	75.00%	1 Missing and 1 partial ⚠️
contribs/gnodev/pkg/packages/resolver_local.go	0.00%	1 Missing ⚠️

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