tdf#89329: use unique_ptr for pImpl in fmpage

Change-Id: I47bc9c2e70ddad5d560cc41db645d9a7085a9aa9
Reviewed-on: https://gerrit.libreoffice.org/25936Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>

include/svx/fmpage.hxx

@@ -43,7 +43,7 @@ class SVX_DLLPUBLIC FmFormPage : public SdrPage
     FmFormPage& operator=(const FmFormPage&) = delete;
 
     friend class FmFormObj;
-    FmFormPageImpl*     m_pImpl;
+    std::unique_ptr<FmFormPageImpl>     m_pImpl;
     OUString            m_sPageName;
 
 public:

svx/source/form/fmpage.cxx

@@ -73,7 +73,6 @@ void FmFormPage::lateInit(const FmFormPage& rPage, FmFormModel* const pNewModel)
 
 FmFormPage::~FmFormPage()
 {
-    delete m_pImpl;
 }