analyzer: postpone selecting saved tool

... until the analyze mode is actually selected

Change-Id: I7d03c48a4b4260d54bf3218b3a493ceacd2d2967
Reviewed-on: http://codereview.qt.nokia.com/1243


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: hjk <qthjk@ovi.com>