fix completely incorrect use of parse (by me)

parse obviously only takes URIs meaning it should be `file:///[path]`

using the file command does that as well as fixing from windows format to file uri format.

Author: jannickj

src/workspace_util.ts

@@ -34,7 +34,7 @@ export function nearestParentWorkspace(
     const cargoPath = path.join(current, 'Cargo.toml');
     if (fs.existsSync(cargoPath)) {
       // ghetto change the uri on Workspace folder to make vscode think it's located elsewhere
-      return { ...curWorkspace, uri: Uri.parse(current) };
+      return { ...curWorkspace, uri: Uri.file(current) };
     }
   }