Fix sort tests for one simple column

By adding expected values in equal expression.

server/pkg/filter/sorting_test.go

@@ -117,7 +117,7 @@ func TestSortUmarshaling(t *testing.T) {
 		{
 			"one simple column",
 			`{"sort": "name DESC", "other": true}`,
-			&tmp{Sorting: Sorting{Sort: SortExprSet{&SortExpr{Column: "name", Descending: true}}}, Other: true},
+			&tmp{Sorting: Sorting{Sort: SortExprSet{&SortExpr{Column: "name", columns: []string{"name"}, Descending: true}}}, Other: true},
 		},
 	}
 	for _, tt := range tests {