Dojo build widget command only output the last one widget when widgets that in different folders has the same name

## bug

In https://github.com/xiaohulu/cli-build-widget-demo, there are two widgets with the same name but place at different folders, like below:


The two widgets are all config at `.dojorc`

```text
{
"build-widget": {
"widgets": [
"src/a/MyWidget.tsx",
"src/b/MyWidget.tsx"
]
}
}
```

Then run `dojo build widget --mode dist --target lib`, the build result only contains `output/dist/b/MyWidget.*`, not contains `/a/MyWidget.*` files.


The code place at https://github.com/xiaohulu/cli-build-widget-demo.

Version: 6.0.2

Thanks!