bug: cortex models stop "Failed to stop models" but actually works

[freelerobot]

1. start model
2. stop model
3. get error msg
4. but model was successfuly stopped

❯ cortex ps
┌─────────┬───────────────────────────────────────────────┬───────────────────┬───────────┬──────────┬─────┬──────┐
│ (index) │                    modelId                    │      engine       │  status   │ duration │ ram │ vram │
├─────────┼───────────────────────────────────────────────┼───────────────────┼───────────┼──────────┼─────┼──────┤
│    0    │ 'bartowski/Llama-3-8B-Instruct-Coder-v2-GGUF' │ 'cortex.llamacpp' │ 'running' │ '1m 22s' │ '-' │ '-'  │
└─────────┴───────────────────────────────────────────────┴───────────────────┴───────────┴──────────┴─────┴──────┘
❯ cortex models start bartowski/Llama-3-8B-Instruct-Coder-v2-GGUF --attach
{
  message: 'Model already loaded',
  modelId: 'bartowski/Llama-3-8B-Instruct-Coder-v2-GGUF'
}
❯ cortex models stop bartowski/Llama-3-8B-Instruct-Coder-v2-GGUF
{
  message: 'Failed to stop model',
  modelId: 'bartowski/Llama-3-8B-Instruct-Coder-v2-GGUF'
}
❯ cortex ps
┌─────────┐
│ (index) │
├─────────┤