chore: rename ifaceprom-1599 to ifaceprom-1559

This test is for issue goplus#1559, not goplus#1599.

Generated with [codeagent](https://github.com/qbox/codeagent)
Co-authored-by: luoliwoshang <51194195+luoliwoshang@users.noreply.github.com>

Author: xgopilot

_demo/go/ifaceprom-1599/foo/foo.go _demo/go/ifaceprom-1559/foo/foo.go_demo/go/ifaceprom-1599/foo/foo.go renamed to _demo/go/ifaceprom-1559/foo/foo.go

@@ -1,6 +1,6 @@
 package main
 
-import "github.com/goplus/llgo/_demo/go/ifaceprom-1599/foo"
+import "github.com/goplus/llgo/_demo/go/ifaceprom-1559/foo"
 
 type Game1 struct {
 	*foo.Game