Edited Issue: package restore doesn't work for projects added after enabling it [2822]

1. create webapplication1
2. install jquery package.
3. enable package restore (which would add the nuget.targets import to the project
4. add new web application2
Actual:
Package restore is not enable for web application 2 and there is no UI option to enable it.
workaround is to manually add the import. and <RestorePackages>true</RestorePackages>

expected:
- since I have already enabled package restore for the entire solution it should have automatically added import for nuget.targets