CCDraw: add private variable col_shadow_clean

Should help to control shadow clean up in some constallations

src/gui/components/cc_draw.cpp

@@ -40,6 +40,7 @@ CCDraw::CCDraw() : COSDFader(g_settings.theme.menu_Content_alpha)
 	col_body = col_body_old			= COL_MENUCONTENT_PLUS_0;
 	col_shadow = col_shadow_old 		= COL_SHADOW_PLUS_0;
 	col_frame = col_frame_old 		= COL_FRAME_PLUS_0;
+	col_shadow_clean			= 0;
 
 	fr_thickness = fr_thickness_old		= 0;
 

src/gui/components/cc_draw.h

@@ -67,6 +67,8 @@ class CCDraw : public COSDFader, public CComponentsSignals
 		fb_pixel_t col_shadow, col_shadow_old;
 		///property: color of frame
 		fb_pixel_t col_frame, col_frame_old;
+		///internal property: color for shadow clean up
+		fb_pixel_t col_shadow_clean;
 
 		 ///property: frame thickness, see also setFrameThickness()
 		int fr_thickness, fr_thickness_old;

src/gui/components/cc_item.cpp

@@ -95,7 +95,6 @@ void CComponentsItem::paintInit(bool do_save_bg)
 		//Workaround: ensure radius values >= 0, framebuffer methode paintBoxRel() gets confused
 		box_rad = max(box_rad, 0);
 
-		fb_pixel_t col_shadow_clean = 0;
 		//if item is bound on a parent form,...
 		if (cc_parent){
 			//...we must use real x/y values and from parent form as reference