Remove unused WebUI images

src/webui/www/webui.qrc

@@ -19,12 +19,10 @@
         <file>private/images/bg-handle-horizontal.gif</file>
         <file>private/images/bg-header.gif</file>
         <file>private/images/bg-panel-header.gif</file>
-        <file>private/images/dock-tabs.gif</file>
         <file>private/images/handle-icon-horizontal.gif</file>
         <file>private/images/handle-icon.gif</file>
         <file>private/images/knob.gif</file>
         <file>private/images/L.gif</file>
-        <file>private/images/logo-blank.gif</file>
         <file>private/images/logo.gif</file>
         <file>private/images/logo2.gif</file>
         <file>private/images/slider-area.gif</file>
@@ -33,7 +31,6 @@
         <file>private/images/spinner.gif</file>
         <file>private/images/tabs.gif</file>
         <file>private/images/toolbox-divider.gif</file>
-        <file>private/images/toolbox-divider2.gif</file>
         <file>private/index.html</file>
         <file>private/newcategory.html</file>
         <file>private/newtag.html</file>