[lldb-dap] Fix the vscode-uninstall command

The command was using the wrong publisher name ("llvm" rather than
"llvm-vs-code-extensions") resulting in the command complaining:

```
npm run vscode-uninstall

> [email protected] vscode-uninstall
> code --uninstall-extension llvm.lldb-dap

Extension 'llvm.lldb-dap' is not installed.
Make sure you use the full extension ID, including the publisher, e.g.: ms-dotnettools.csharp
```

(cherry picked from commit f715124)

Author: JDevlieghere

lldb/tools/lldb-dap/package.json

@@ -44,7 +44,7 @@
     "format": "npx prettier './src-ts/' --write",
     "package": "vsce package --out ./out/lldb-dap.vsix",
     "publish": "vsce publish",
-    "vscode-uninstall": "code --uninstall-extension llvm.lldb-dap",
+    "vscode-uninstall": "code --uninstall-extension llvm-vs-code-extensions.lldb-dap",
     "vscode-install": "code --install-extension ./out/lldb-dap.vsix"
   },
   "contributes": {
@@ -513,4 +513,4 @@
       }
     ]
   }
-}
+}