fix(gnovm): allow passing no vargs to generic functions

[thehowl]

This PR allows the use of append with no arguments. This is an edge case and caught by govet as incorrect usage, but still technically valid code in Go.

[Gno2D2]

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[codecov]

Codecov Report

❌ Patch coverage is 80.95238% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/pkg/gnolang/types.go	80.95%	3 Missing and 1 partial ⚠️

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