Related tdf#103421: disposeAndClear m_aColorSet (reportdesign)

m_aColorSet has been declared as VclPtr<ValueSet>
then initialized with VclPtr<ValueSet>::Create(this, WinBits( WB_ITEMBORDER | WB_NAMEFIELD | WB_3DLOOK | WB_NO_DIRECTSELECT))
Following vcl/README.lifecycle, we're on the case 2 of "Who owns & disposes what ?"
so we should use disposeAndClear

Change-Id: I5809b54b8a15c365362c05c35a7499d8f4f69ed2
Reviewed-on: https://gerrit.libreoffice.org/30176Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

reportdesign/source/ui/dlg/Condition.cxx

@@ -160,7 +160,7 @@ OColorPopup::~OColorPopup()
 void OColorPopup::dispose()
 {
     disposeBuilder();
-    m_aColorSet.clear();
+    m_aColorSet.disposeAndClear();
     m_pCondition.clear();
     FloatingWindow::dispose();
 }