refactor(@angular/cli): fix incorrect merge in install package

This is to align with current master https://github.com/angular/angular-cli/blob/85b671147ed67d7aa6ceb4b8fe4d26b73fff75ba/packages/angular/cli/tasks/install-package.ts#L90-L100

Author: alan-agius4

packages/angular/cli/tasks/install-package.ts

@@ -78,14 +78,7 @@ export function installTempPackage(
 
   // setup prefix/global modules path
   const packageManagerArgs = getPackageManagerArguments(packageManager);
-  let tempNodeModules: string;
-  if (packageManager !== PackageManager.Yarn && process.platform !== 'win32') {
-    // Global installs on Unix systems go to {prefix}/lib/node_modules.
-    // Global installs on Windows go to {prefix}/node_modules (that is, no lib folder.)
-    tempNodeModules = join(tempPath, 'lib', 'node_modules');
-  } else {
-    tempNodeModules = join(tempPath, 'node_modules');
-  }
+  const tempNodeModules = join(tempPath, 'node_modules');
 
   const installArgs: string[] = [
     packageManagerArgs.prefix,