sqlitedb: Only create indexes after introspection
sqlitedb: Only create indexes after introspection

This avoids errors of the kind "e-book-backend-file.c:1478: Failed to open
sqlitedb: table folder_id has no column named file_as" when opening an
addressbook with customized summary a second time, but with default
settings.

matzipan/evolution-data-server,Distrotech/evolution-data-server,Distrotech/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,Distrotech/evolution-data-server,tintou/evolution-data-server,tintou/evolution-data-server,Distrotech/evolution-data-server,Distrotech/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server