Nuclear bomb timer visibility (#7332)

# About the pull request

Gives xenos the same notification about bomb decryption time that preds
and humans get when the decryption is initially activated or activated
after being deactivated.

# Explain why it's good for the game

Parity. Preds get a timer notification before the nuke finishes
decrypting for example. Why do xenos not get this? Also if it's a case
of decryption being reactivated after a long time of deactivation, it's
only fair that the message isn't exactly the same as if they're starting
it for the first time - because the timer can potentially be much
shorter.

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

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
qol: xenos get the same bomb decryption timer notification that preds
get
/:cl:

code/game/machinery/nuclearbomb.dm

@@ -609,7 +609,7 @@ GLOBAL_VAR_INIT(bomb_set, FALSE)
 			hive = GLOB.hive_datum[hivenumber]
 			if(!length(hive.totalXenos))
 				continue
-			xeno_announcement(SPAN_XENOANNOUNCE("The tallhosts have started the initial phase of a hive killer at [get_area_name(loc)]! Destroy their communications relays!"), hive.hivenumber, XENO_GENERAL_ANNOUNCE)
+			xeno_announcement(SPAN_XENOANNOUNCE("The tallhosts have started the initial phase of a hive killer at [get_area_name(loc)]! You have about [time_left] to destroy at least one of their communications relays!"), hive.hivenumber, XENO_GENERAL_ANNOUNCE)
 		return
 
 	announcement_helper("ALERT.\n\nNUCLEAR EXPLOSIVE DECRYPTION HALTED.", "[MAIN_AI_SYSTEM] Nuclear Tracker", humans_uscm, 'sound/misc/notice1.ogg')