CMake build: Fix missing tool button icon

- for the branding feature CMake uses a different, generated qrc file
- move the Qt logo out of the Qt Creator logo files, it doesn't belong
  there

Amends 5eafa345ed

Fixes: QTCREATORBUG-26969
Change-Id: I6f3d87abd52810d42142073ac944e6553c38caf1
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/coreplugin/core.qrc

@@ -6,7 +6,7 @@
         <file>images/settingscategory_core@2x.png</file>
         <file>images/settingscategory_design.png</file>
         <file>images/settingscategory_design@2x.png</file>
-        <file alias="images/qtlogo.png">images/logo/16/Qt_logo_green.png</file>
-        <file alias="images/qtlogo@2x.png">images/logo/32/Qt_logo_green.png</file>
+        <file>images/qtlogo.png</file>
+        <file>images/qtlogo@2x.png</file>
     </qresource>
 </RCC>

src/plugins/coreplugin/core.qrc.cmakein

@@ -6,5 +6,7 @@
     <file alias="images/settingscategory_core@2x.png">${CMAKE_CURRENT_SOURCE_DIR}/images/settingscategory_core@2x.png</file>
     <file alias="images/settingscategory_design.png">${CMAKE_CURRENT_SOURCE_DIR}/images/settingscategory_design.png</file>
     <file alias="images/settingscategory_design@2x.png">${CMAKE_CURRENT_SOURCE_DIR}/images/settingscategory_design@2x.png</file>
+    <file alias="images/qtlogo.png">${CMAKE_CURRENT_SOURCE_DIR}/images/qtlogo.png</file>
+    <file alias="images/qtlogo@2x.png">${CMAKE_CURRENT_SOURCE_DIR}/images/qtlogo@2x.png</file>
     </qresource>
 </RCC>