Roundstart xeno egg alert is included in the roundstart report (#95608)

## About The Pull Request

Roundstart xeno egg no longer sends a second report if it rolls, now
instead adding an addendum to the roundstart report

<img width="409" height="111" alt="image"
src="https://github.com/user-attachments/assets/14a62737-4d01-4240-8d3f-975e409d1fc2"
/>

## Why It's Good For The Game

I never really liked how meta-game-able the second alert is, the moment
you hear `Secure command report created` 2 minutes into the round you
know it's an egg round. Combining the roundstart alerts give the command
staff the option of trying to hide it which could be fun.

## Changelog

🆑 Melbert
qol: Roundstart xeno egg is now mentioned in the roundstart report as an
addendum, rather than as a second report (usually) following the
roundstart report.
/🆑

code/datums/communications.dm

@@ -120,7 +120,7 @@ GLOBAL_DATUM_INIT(communications_controller, /datum/communciations_controller, n
 
 		for(var/datum/command_footnote/footnote as anything in command_report_footnotes)
 			footnote_pile += "[footnote.message]<BR>"
-			footnote_pile += "<i>[footnote.signature]</i><BR>"
+			footnote_pile += "~ <i>[footnote.signature]</i><BR>"
 			footnote_pile += "<BR>"
 
 		. += "<hr><h4>Additional Notes: </h4>" + footnote_pile