Call hierarchy not work at gop file

[jack]

What version of Go, VS Code & VS Code Go extension are you using?

Version Information

• Run go version to get version of Go from the VS Code integrated terminal.
  • go version go1.21.4 darwin/arm64
• Run gopls -v version to get version of Gopls from the VS Code integrated terminal.
  • golang.org/x/tools/gopls@v0.14.2
• Check your installed extensions to get the version of the VS Code Go+ extension
  • v0.1.0-dev

Describe the bug

Call hierarchy not work at gop file

Steps to reproduce the behavior:

1. Open Gop File
2. Select function and Click "Show Call Hierarchy"
3. See "No results"

[jack]

fix by goplus/tools#120