fix: restore intended behavior of nnrf-nfm/v1/nf-instances endpoint (#48

)

The nnrf-nfm/v1/nf-instances endpoint tried to get request query
parameters by extracting the from the request path using
c.Params.ByName.

This resulted in empty results for nfType and limitParam and thus always
returned 400 on every request.

internal/sbi/api_nfmanagement.go

@@ -194,8 +194,8 @@ func (s *Server) HTTPUpdateNFInstance(c *gin.Context) {
 
 // GetNFInstances - Retrieves a collection of NF Instances
 func (s *Server) HTTPGetNFInstances(c *gin.Context) {
-	nfType := c.Params.ByName("nf-type")
-	limitParam := c.Params.ByName("limit")
+	nfType := c.Query("nf-type")
+	limitParam := c.Query("limit")
 
 	if nfType == "" || limitParam == "" {
 		problemDetail := &models.ProblemDetails{