Baloo-widgets soversion

[Antonio Rojas]

Hi,
 In 18.08 baloo-widgets follows the KDE-Applications version number. This 
has the side effect that the libKF5BalooWidgets soversion has bumped from 5 
to 18, and will presumably keep getting bumped every year (regardless of 
API changes). This seems wrong to me. Looking at the source it seems the 
soversion is given by a BALOO_WIDGETS_SOVERSION variable, which is however 
not being set anywhere. If this is not intentional (as I hope), it should 
be fixed before the final 18.08 release.