cameo: also connect paths from gnuplot files

We only did this for Gerber.

cameo/gnuplot.c

@@ -85,7 +85,7 @@ struct path *gnuplot_read(const char *name, double r_tool_default)
 		path_add(path, x, y, z);
 	}
 	fclose(file);
-	return paths;
+	return path_connect(paths);
 }