cui: unused code in SvxAreaTabPage::ClickHatchingHdl_Impl()

Turns out 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 -> Hatching in Writer.

Change-Id: Ic26cc592c0792f966c52dd2ac6de8657ff635cd3
writerfilter: remove unused genclass.xsl

Change-Id: I4a76c13fb01e728613211ae3e4959f75a151ff33