Remove a macOS rendering bug workaround

Most important Cairo bugs seem to have been fixed recently.

fiv.c

@@ -388,12 +388,6 @@ on_about_draw(GtkWidget *widget, cairo_t *cr, gpointer user_data)
 	GtkStyleContext *style = gtk_widget_get_style_context(widget);
 	gtk_render_background(style, cr, 0, 0, allocation.width, allocation.height);
 
-	// The transformation matrix turns out/is applied wrongly on Quartz.
-	gboolean broken_backend = cairo_surface_get_type(cairo_get_target(cr)) ==
-		CAIRO_SURFACE_TYPE_QUARTZ;
-	if (broken_backend)
-		cairo_push_group(cr);
-
 	cairo_translate(cr, (allocation.width - ABOUT_SIZE * ABOUT_SCALE) / 2,
 		ABOUT_SIZE * ABOUT_SCALE / 4);
 	cairo_scale(cr, ABOUT_SCALE, ABOUT_SCALE);
@@ -419,11 +413,6 @@ on_about_draw(GtkWidget *widget, cairo_t *cr, gpointer user_data)
 
 	cairo_restore(cr);
 	draw_ligature(cr);
-
-	if (broken_backend) {
-		cairo_pop_group_to_source(cr);
-		cairo_paint(cr);
-	}
 	return TRUE;
 }