Remove superfluous code for empty KIPI toolbar button
Summary:
In case there are no KIPI plugins installed, Gwenview needs to show the
No Plugin Found entry instead.
Since the corresponding action is already added to mExportActionList
in KIPIInterface::pluginActions, we don't need to add it again.
Test Plan:
Uninstall Discover and kipi-plugins, check that KIPI toolbar
button still shows No Plugin Found.
Reviewers: Gwenview, faridb
Reviewed By: faridb
Differential Revision: https://phabricator.kde.org/D13251