Fix wrong icon path

Regression introduced by 15fbfaf2e9

Change-Id: I795519fbf8f0370399583af8268bb4cc6bd3530d
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

src/libs/utils/utilsicons.cpp

@@ -178,6 +178,7 @@ const Icon COLLAPSE({
         {QLatin1String(":/utils/images/collapse.png"), Theme::PanelTextColorMid}}, Icon::Tint);
 const Icon COLLAPSE_TOOLBAR({
         {QLatin1String(":/utils/images/collapse.png"), Theme::IconsBaseColor}});
+const Icon EMPTY14(":/utils/images/empty14.png");
 
 } // namespace Icons
 } // namespace Utils