generate_load_scripts: true is working before install

[matthid]

Description

add generate_load_scripts: true to paket.dependencies
run paket restore

Expected behavior

EITHER

1. load scripts are NOT generated and a warning is shown that the lockfile is outdated
2. load scripts are generated and NO warning is shown.

I'm not sure what I'd prefer, either one is OK

Actual behavior

load scripts ARE generated AND a warning is shown

Changes were detected for Main/System.Xml.XDocument
    - SettingsChanged
Changes were detected for Main/Zlib.Portable
    - SettingsChanged
...
Generating load scripts for framework - net20
[ Group - Main ]
 - .paket\load\net20\FSharp.Compiler.Service.fsx
...