Fixes Hijack Dropship launch announcement alarm not turning off - Bwo…

…op is Kil (#5025)

# About the pull request

Turns the launch alarm off on dropships when the queen hijacks a ship.

# Explain why it's good for the game

Players found the alarm annoying when the ship was hijacked with the
alarm sounding and they couldn't turn it off.

# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty 

<details>
Happens in the first few seconds so you don't have to listen to youtube
and alarms and sensory overload


https://github.com/cmss13-devs/cmss13/assets/142365554/12485a52-a887-4ce0-825d-bb0b33e7e98d

</details>


# Changelog

:cl:
fix: Disables launch announcment alarm if it's sounding when queen
hijacks
/:cl:

---------

Co-authored-by: Drathek <[email protected]>

code/modules/shuttle/computers/dropship_computer.dm

@@ -270,6 +270,9 @@
 	hijack.fire()
 	GLOB.alt_ctrl_disabled = TRUE
 
+	dropship.alarm_sound_loop.stop()
+	dropship.playing_launch_announcement_alarm = FALSE
+
 	marine_announcement("Unscheduled dropship departure detected from operational area. Hijack likely. Shutting down autopilot.", "Dropship Alert", 'sound/AI/hijack.ogg', logging = ARES_LOG_SECURITY)
 	log_ares_flight("Unknown", "Unscheduled dropship departure detected from operational area. Hijack likely. Shutting down autopilot.")