neutrino: adapt to the framebuffer_spark blitter change

basically add fb->blit() in every widget where necessary to
make sure the framebuffer is updated with current content

src/gui/filebrowser.cpp

@@ -855,6 +855,7 @@ bool CFileBrowser::exec(const char * const dirname)
 	ChangeDir(name);
 	paint();
 	paintFoot();
+	frameBuffer->blit();
 
 	int oldselected = selected;
 
@@ -1115,6 +1116,7 @@ bool CFileBrowser::exec(const char * const dirname)
 				loop = false;
 			}
 		}
+		frameBuffer->blit();
 	}
 
 	hide();
@@ -1221,6 +1223,7 @@ void CFileBrowser::addRecursiveDir(CFileList * re_filelist, std::string rpath, b
 void CFileBrowser::hide()
 {
 	frameBuffer->paintBackgroundBoxRel(x,y, width,height);
+	frameBuffer->blit();
 }
 
 //------------------------------------------------------------------------