Conflicting assets instructions in mobile:development

[y-lohse]

When running cozy-scripts with target=mobile and env=development, there are contradictions about what to do with cozy-client-js and cozy-bar.

• The dev config copies the files (to the wrong folder), an tries to inject them in the app. It also treats everything cozy as an external.
• In the mobile config, we provide the assets

It's not a big deal — since the fiels are copied in the wrong directory, they don't get loaded by the app. Even if they are copied into the right directory… they get included twice, which might lead to side effects but is still ok.

Not sure what the correct solution here is though.