fix: retain visibility when editing (#83)

* fix: retain visibility when editing

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* review(thomiceli): remove private conversion in dto

Signed-off-by: jolheiser <john.olheiser@gmail.com>

---------

Signed-off-by: jolheiser <john.olheiser@gmail.com>

internal/models/gist.go

@@ -399,6 +399,5 @@ func (dto *GistDTO) ToGist() *Gist {
 func (dto *GistDTO) ToExistingGist(gist *Gist) *Gist {
 	gist.Title = dto.Title
 	gist.Description = dto.Description
-	gist.Private = dto.Private
 	return gist
 }