Fix default value of "leases" attribute

[legal90]

It fixes an error:

           ================================================================================
           Error executing action `read` on resource 'vault_secret[secret/secretpath]'
           ================================================================================

           TypeError
           ---------
           no implicit conversion of String into Integer

           Cookbook Trace:
           ---------------
           /tmp/kitchen/cache/cookbooks/hashicorp-vault/libraries/vault_secret.rb:66:in `[]'
           /tmp/kitchen/cache/cookbooks/hashicorp-vault/libraries/vault_secret.rb:66:in `block (2 levels) in <class:VaultSecret>'
           /tmp/kitchen/cache/cookbooks/poise/files/halite_gem/poise/helpers/subcontext_block.rb:54:in `instance_eval'
           /tmp/kitchen/cache/cookbooks/poise/files/halite_gem/poise/helpers/subcontext_block.rb:54:in `subcontext_block'
           /tmp/kitchen/cache/cookbooks/poise/files/halite_gem/poise/helpers/notifying_block.rb:67:in `notifying_block'
           /tmp/kitchen/cache/cookbooks/hashicorp-vault/libraries/vault_secret.rb:60:in `block in <class:VaultSecret>'

That was my bad, introduced by #56. I'm sorry 😞

[Ginja]

👍

[lock]

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