config/module: can load a tree properly

config/module/module.go

@@ -4,5 +4,4 @@ package module
 type Module struct {
 	Name   string
 	Source string
-	Dir    string
 }

config/module/test-fixtures/basic/foo/main.tf

@@ -0,0 +1 @@
+# Hello

config/module/tree.go

@@ -101,7 +101,7 @@ func (t *Tree) Load(s Storage, mode GetMode) error {
 	// Go through all the modules and get the directory for them.
 	update := mode == GetModeUpdate
 	for i, m := range modules {
-		source, err := Detect(m.Source, m.Dir)
+		source, err := Detect(m.Source, t.config.Dir)
 		if err != nil {
 			return fmt.Errorf("module %s: %s", m.Name, err)
 		}