Revert "Testconfig: Enable making tests when building iOS stage"

This reverts commit 6476c7cf971ced07bd2f8edc1f3c8bf7a235ef3d

Broke qtdeclarative integrations because of some .pro file bugs and tests not compiling for iOS

Change-Id: I26576b42894c913320b6b0eb84807da9ebb04946
Reviewed-by: Simo Fält <simo.falt@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>