Revert unnecessary change in packages api

Author: lunny

routers/api/packages/api.go

@@ -28,11 +28,6 @@ import (
 
 func reqPackageAccess(accessMode perm.AccessMode) func(ctx *context.Context) {
 	return func(ctx *context.Context) {
-		if !setting.Packages.Enabled {
-			ctx.Error(http.StatusNotImplemented)
-			return
-		}
-
 		if ctx.Package.AccessMode < accessMode && !ctx.IsUserSiteAdmin() {
 			ctx.Resp.Header().Set("WWW-Authenticate", `Basic realm="Gitea Package API"`)
 			ctx.Error(http.StatusUnauthorized, "reqPackageAccess", "user should have specific permission or be a site admin")