🐛 [BUG] Bullet plot does not show all data when rendering a shared tooltip

### 🐛 Bug description [Please make everyone to understand it]

The `shared` tooltip of a `Bullet` plot does not show all data points when hovering over the bar.

### 💻 Link to minimal reproduction

[Codesandbox repo](https://codesandbox.io/s/g2plot-bullet-axis-bug-forked-lpdos?file=/src/index.js)

### 📷 Step to reproduce

Open the codesandbox repo and hover with your mouse over the bar (notice the `shared` tooltip option is enabled). You will see that the tooltip shows only the `measures` value, and not the `target` value. However, if you hover the mouse over the target, it correctly shows both.

### 🏞 Expected result

All values should be shown regardless of where a user hovers their mouse when the tooltip has `shared` enabled.

### 🚑 Any additional [like screenshots]

* **G2Plot Version**:
* **Platform**:

Start with the linked Codesandbox reproduction, especially src/index.js, and inspect the Bullet plot configuration where the shared tooltip is enabled. Reproduce the hover behavior over the bar and target; done means the shared tooltip shows both measures and target values regardless of the hover location.

Written by the indexing model from the issue text.