ask the icon cache for the inline block icon

src/ui/HeaderBar.h

@@ -61,10 +61,6 @@ private:
     // (REQ-UI-BLOCKS-ICON).
     void updateBlocksLabel();
 
-    // The building_block icon at the header's text height, or a null pixmap when no
-    // icon file exists. Loaded once via m_itemIcons on first use.
-    QPixmap blockIcon() const;
-
     QLabel*                  m_timeLabel;
     QLabel*                  m_blocksLabel;
     QLabel*                  m_artifactsLabel;