BUG: Custom System Prompt not loading

### What is the issue? # Bug Report ## Description If I use any LLava models ([LLava-Phi-3](https://ollama.com/library/llava-phi3)), the custom System prompt ist working fine. But if I upload an Picture at the start of the Conversation, the System Prompt is not Loading and if I continue the Conversation it still not have the custom System Prompt. Only if I start the new Chat with only text as an Input, the System prompt is loading correctly. **Bug Summary:** Custom System Prompt not loading **Steps to Reproduce:** [Outline the steps to reproduce the bug. Be as detailed as possible.] 1. Load an LLava Model 2. Create a Custom System Prompt in Settings or in Modelfile 3. Upload a Picture and ask something about the Picture, and no Custom System Prompt loaded!!! 4. Continue conversation, but still there is no Custom System Prompt loaded!!! ## Environment - **Open WebUI Version:** [0.1.124] - **Ollama (if applicable):** [e.g., 0.1.37] - **Operating System:** [Ubuntu 20.04] - **Browser:** [Chrome] ### OS Linux ### GPU _No response_ ### CPU AMD ### Ollama version 0.1.37