Initialize xv_need_bobdeint_repaint in ctor

Commit c2b1683
added the xv_need_bobdeint_repaint member variable
but did not add it to the ctor.

Fixes Coverity 700920

Fixes #11673

Signed-off-by: Paul Harrison <pharrison@mythtv.org>

mythtv/libs/libmythtv/videoout_xv.cpp

@@ -147,6 +147,7 @@ VideoOutputXv::VideoOutputXv()
       xv_port(-1),      xv_hue_base(0),
       xv_colorkey(0),   xv_draw_colorkey(false),
       xv_chroma(0),     xv_set_defaults(false),
+      xv_need_bobdeint_repaint(false),
       xv_use_picture_controls(true),
 
       chroma_osd(NULL)