Added the QtSQL dependency info. to the project file

Without this information the app fails to find the plugin
required to load the QtQuick.LocalStorage module on Android.

Task-number: QTBUG-37203
Change-Id: I245012e78ab8d1fe3205e08939f4baec58c20759
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>