Fix package manager undefined (#762)

#735 uses the
`packageManager` variable that comes from launch configuration instead
of `manager` that was just matched for the given lock file. This results
in packager beeing `undefined`.

Fixes #760

### How Has This Been Tested: 

- Remove node_modules from expo-go project 
- Run IDE in given project
- The IDE should launch

packages/vscode-extension/src/utilities/packageManager.ts

@@ -88,7 +88,7 @@ export async function resolvePackageManager(): Promise<PackageManagerInfo | unde
     for (const file of files) {
       const manager = lockFiles.get(file);
       if (manager) {
-        packageManagerCandidates.push(packageManager);
+        packageManagerCandidates.push(manager);
       }
     }