Remove pause on fullscreening in NS (bug#48406)

Remove pause on fullscreening in NS (bug#48406)

* src/nsterm.m (ns_make_frame_visible):
(ns_set_parent_frame):
([EmacsView windowWillEnterFullScreen:]):
([EmacsView windowDidEnterFullScreen:]):
([EmacsView windowWillExitFullScreen:]):
([EmacsView initFrameFromEmacs:]): Remove references to
in_fullscreen_transition.
([EmacsView toggleFullScreen:]): Remove calls to removed methods.
([EmacsView inFullScreenTransition]):
([EmacsView waitFullScreenTransition]): Remove Methods.
* src/nsterm.h (EmacsView): Remove defintions of removed methods, and
the in_fullscreen_transition variable.