[MIRROR] adds missing SIGNAL_HANDLERs (#10768)

Co-authored-by: SatinIsle <98125273+SatinIsle@users.noreply.github.com>

code/modules/tgui/modules/appearance_changer.dm

@@ -868,6 +868,7 @@
 	return data
 
 /datum/tgui_module/appearance_changer/proc/update_active_camera_screen()
+	SIGNAL_HANDLER
 	cam_screen.vis_contents = list(owner) // Copied from the vore version.
 	cam_background.icon_state = "clear"
 	cam_background.fill_rect(1, 1, 1, 1)
@@ -1001,6 +1002,7 @@
 	return ..()
 
 /datum/tgui_module/appearance_changer/vore/update_active_camera_screen()
+	SIGNAL_HANDLER
 	cam_screen.vis_contents = list(owner)
 	cam_background.icon_state = "clear"
 	cam_background.fill_rect(1, 1, 1, 1)

code/modules/tgui/modules/camera.dm

@@ -180,6 +180,7 @@
 				. = TRUE
 
 /datum/tgui_module/camera/proc/update_active_camera_screen()
+	SIGNAL_HANDLER
 	if(!active_camera)
 		show_camera_static()
 		return TRUE

code/modules/tgui/modules/ntos-only/uav.dm

@@ -118,6 +118,7 @@
 				unlook(M)
 
 /datum/tgui_module/uav/proc/current_uav_changed_z(old_z, new_z)
+	SIGNAL_HANDLER
 	signal_strength = get_signal_to(current_uav)
 	if(!signal_strength)
 		clear_current()

code/modules/tgui/modules/overmap.dm

@@ -85,6 +85,7 @@
 	LAZYDISTINCTADD(viewers, WEAKREF(user))
 
 /datum/tgui_module/ship/proc/unlook(var/mob/user)
+	SIGNAL_HANDLER
 	user.reset_view()
 	user.set_viewsize() // reset to default
 	if(map_view_used)