Drop KDE5FilePicker::setDescription

Base class's 'Qt5FilePicker::setDescription'
does the same, namely nothing.

Change-Id: Ie89a1e1edaf20c49a1b16f43000a4a054b21f3b2
Reviewed-on: https://gerrit.libreoffice.org/68051
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>

vcl/unx/kde5/KDE5FilePicker.hxx

@@ -95,9 +95,6 @@ public:
     virtual void SAL_CALL setLabel(sal_Int16 nControlId, const OUString& rLabel) override;
     virtual OUString SAL_CALL getLabel(sal_Int16 nControlId) override;
 
-    // XFolderPicker stuff
-    virtual void SAL_CALL setDescription(const OUString& rDescription) override;
-
     /* TODO XFilePreview
 
     virtual css::uno::Sequence< sal_Int16 > SAL_CALL getSupportedImageFormats(  );

vcl/unx/kde5/KDE5FilePicker2.cxx

@@ -336,8 +336,6 @@ OUString SAL_CALL KDE5FilePicker::getLabel(sal_Int16 controlId)
     return label;
 }
 
-void SAL_CALL KDE5FilePicker::setDescription(const OUString&) {}
-
 void KDE5FilePicker::addCustomControl(sal_Int16 controlId)
 {
     const char* resId = nullptr;