cui: unused code in SvxAreaTabPage::ClickBitmapHdl_Impl
cui: unused code in SvxAreaTabPage::ClickBitmapHdl_Impl

This is unused since commit 5627d0bdaf1385df9d90dcec3a319c82c089c2ca
(Fix #86988#: Redesign of dialogs, 2001-05-15), and just getting rid of
it avoids a crash on Insert -> Frame -> Area -> Bitmap in Writer.

Copy&paste of problematic code, take 3.

Change-Id: Ide488585bbc6aed157fa6058bcfd1cd0a6d2c7aa

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core