Fix NS toolbar again (bug#50534)

Fix NS toolbar again (bug#50534)

* src/nsmenu.m (free_frame_tool_bar): Remove toolbar.
(update_frame_tool_bar_1): New function.
(update_frame_tool_bar): Move most of the functionality to
update_frame_tool_bar_1.
* src/nsterm.h: Definitions of functions and methods.
* src/nsterm.m (ns_update_begin):
([EmacsView windowDidEnterFullScreen]):
([EmacsView windowDidExitFullScreen]): We no longer need to reset the
toolbar visibility as that's done when we create the new fullscreen
window.
([EmacsWindow initWithEmacsFrame:fullscreen:screen:]): Move the check
for undecorated frames into createToolbar:.
([EmacsWindow createToolbar:]): Check whether a toolbar should be
created, and run the toolbar update immediately.