Custom TextEditor settings aren't applied on session restore.

Steps to reproduce:

• create a session
• create a qmake project
• edit the project specific editor settings
• open the .pro file
• check that the custom settings are working
• do not close the project file
• close creator
• open creator with the session which was created in step 1
• the project file should be opened again
• the custom settings aren't applied to the pro file editor

Hints:
SessionManager::configureEditor is called before the project was completely parsed.