Fix it so disable a module does not disable transitive dependency required by others

The motivation behind the original implementation was probably to show disabled modules when running `hugo mod graph`.

Fixes #11376

modules/module.go

@@ -40,9 +40,6 @@ type Module interface {
 	// Directory holding files for this module.
 	Dir() string
 
-	// This module is disabled.
-	Disabled() bool
-
 	// Returns whether this is a Go Module.
 	IsGoMod() bool
 
@@ -81,7 +78,6 @@ type moduleAdapter struct {
 	dir        string
 	version    string
 	vendor     bool
-	disabled   bool
 	projectMod bool
 	owner      Module
 
@@ -115,10 +111,6 @@ func (m *moduleAdapter) Dir() string {
 	return m.gomod.Dir
 }
 
-func (m *moduleAdapter) Disabled() bool {
-	return m.disabled
-}
-
 func (m *moduleAdapter) IsGoMod() bool {
 	return m.gomod != nil
 }