Fix --ask-vault-pass prompt to match old when poss (#27602)

If we don't use more than one vault-id, and we use
--ask-vault-pass, instead of using the new vault prompt
format ('Vault password (my_vault_id): ') we use the old
one ('Vault password: ').

This avoids confusing Tower when it needs to detect an
interactive vault password prompt.

This also potentially could allow vault password prompts
to be customized per vault_id.

lib/ansible/parsing/vault/__init__.py

@@ -259,7 +259,7 @@ class PromptVaultSecret(VaultSecret):
         b_vault_passwords = []
 
         for prompt_format in self.prompt_formats:
-            prompt = prompt_format % self.vault_id
+            prompt = prompt_format % {'vault_id': self.vault_id}
             try:
                 vault_pass = display.prompt(prompt, private=True)
             except EOFError: