The command `pass code ls` is broken

When the command `pass code ls` is executed, it prints an empty tree:
```➜  pass code ls
Password Store
└──
```
The desired output should be the human-readable password store tree:
```➜  pass code ls
Password Store
├── folder-1
│   └── subfolder-1
│       └── file-1
└── folder-2
    └── subfolder-2
        └── file-2
```
