Add ability to active pane in list-windows and find-window formats, from

Carl Henrik Lunde.

cmd-find-window.c

@@ -193,6 +193,7 @@ cmd_find_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 		    ARRAY_ITEM(&find_list, i).list_ctx);
 		format_session(cdata->ft, s);
 		format_winlink(cdata->ft, s, wm);
+		format_window_pane(cdata->ft, wm->window->active);
 
 		window_choose_add(wl->window->active, cdata);
 	}

cmd-list-windows.c

@@ -99,6 +99,7 @@ cmd_list_windows_session(
 		format_add(ft, "line", "%u", n);
 		format_session(ft, s);
 		format_winlink(ft, s, wl);
+		format_window_pane(ft, wl->window->active);
 
 		line = format_expand(ft, template);
 		ctx->print(ctx, "%s", line);