Improved OptProp logging

The existing log was too verbose because triggered when
a specific value for a property was not specified which is
the most common case.

Now the log is triggered when a wrong value for a boolean
property is set.

Flag: EXEMPT Refactoring
Fix: 418974224
Test: atest WmTests:OptPropFactoryTest

Change-Id: I9295049c5dc2001ac0284d3050ea6b35d84bf57b