D8946: Avoid unnecessary 'dataChanged' signal

[Renato Oliveira Filho]

renatoo added a dependent revision: D8947: Expose KFilePlacesModel 'iconName'  
rule.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D8946

To: renatoo, dfaure
Cc: #frameworks