Removed "private" generators from command list.

Appropriate way to handle encrypted command is by `bin/rails credentials` and
`bin/rails encrypted`

It was displayed on `bin/rails generate` command:
```
Please choose a generator below.

Rails:
  application_record
  assets
  channel
  controller
  encrypted_file
  encryption_key_file
  generator
  ...
```

1 files changed, 3 insertions, 0 deletions

diff --git a/railties/lib/rails/generators.rb b/railties/lib/rails/generators.rb
index 6c9c109f17..6a7175c02b 100644
--- a/railties/lib/rails/generators.rb
+++ b/railties/lib/rails/generators.rb
@@ -218,6 +218,9 @@ module Rails
         rails.delete("app")
         rails.delete("plugin")
         rails.delete("encrypted_secrets")
+        rails.delete("encrypted_file")
+        rails.delete("encryption_key_file")
+        rails.delete("master_key")
         rails.delete("credentials")
 
         hidden_namespaces.each { |n| groups.delete(n.to_s) }