Edit name of Gemini 3.1 Flash Lite to Gemini 3.1 Flash-Lite to better match Google's official documentation (#59322)

## Solution

- A simple find and replace.

## Testing

- Did you test these changes? If so, how? No, as in my opinion, a single
character change in a string does not justify the time it takes to
recompile
- Are there any parts that need more testing? No.
- How can other people (reviewers) test your changes? Is there anything
specific they need to know? Just open the models UI.
- If relevant, what platforms did you test these changes on, and are
there any important ones you can't test?

## Self-Review Checklist:

- [X] I've reviewed my own diff for quality, security, and reliability
- [X] Unsafe blocks (if any) have justifying comments
- [X] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [X] Tests cover the new/changed behavior
- [X] Performance impact has been considered and is acceptable

---

Release Notes:

- Edit name of Gemini 3.1 Flash Lite to Gemini 3.1 Flash-Lite to better
match Google's official documentation

crates/google_ai/src/google_ai.rs

@@ -570,7 +570,7 @@ impl Model {
             Self::Gemini25FlashLite => "Gemini 2.5 Flash-Lite",
             Self::Gemini25Flash => "Gemini 2.5 Flash",
             Self::Gemini25Pro => "Gemini 2.5 Pro",
-            Self::Gemini31FlashLite => "Gemini 3.1 Flash Lite",
+            Self::Gemini31FlashLite => "Gemini 3.1 Flash-Lite",
             Self::Gemini3Flash => "Gemini 3 Flash",
             Self::Gemini35Flash => "Gemini 3.5 Flash",
             Self::Gemini31Pro => "Gemini 3.1 Pro",