various 516 tweaks (#7071)

@LetterN did like everything I'm late to the party so I'm just here to
clean things up 😊

code/modules/admin/secrets/admin_secrets/bombing_list.dm

@@ -9,4 +9,4 @@
 	var/dat = "<B>Bombing List</B>"
 	for(var/l in bombers)
 		dat += "[l]<BR>"
-	user << browse(dat, "window=bombers")
+	user << browse(HTML_SKELETON(dat), "window=bombers")

code/modules/admin/secrets/admin_secrets/list_dna.dm

@@ -11,4 +11,4 @@
 		if(H.dna && H.ckey)
 			dat += "<tr><td>[H]</td><td>[H.dna.unique_enzymes]</td><td>[H.b_type]</td></tr>"
 	dat += "</table>"
-	user << browse(dat, "window=DNA;size=440x410")
+	user << browse(HTML_SKELETON(dat), "window=DNA;size=440x410")

code/modules/admin/secrets/admin_secrets/list_fingerprints.dm

@@ -16,4 +16,4 @@
 			else if(!H.dna)
 				dat += "<tr><td>[H]</td><td>H.dna = null</td></tr>"
 	dat += "</table>"
-	user << browse(dat, "window=fingerprints;size=440x410")
+	user << browse(HTML_SKELETON(dat), "window=fingerprints;size=440x410")

code/modules/admin/secrets/admin_secrets/show_crew_manifest.dm

@@ -9,4 +9,4 @@
 	dat += "<h4>Crew Manifest</h4>"
 	dat += data_core.get_manifest()
 
-	user << browse(dat, "window=manifest;size=370x420;can_close=1")
+	user << browse(HTML_SKELETON(dat), "window=manifest;size=370x420;can_close=1")

code/modules/admin/secrets/admin_secrets/show_law_changes.dm

@@ -12,4 +12,4 @@
 	var/dat = "<B>Showing last [length(lawchanges)] law changes.</B><HR>"
 	for(var/sig in lawchanges)
 		dat += "[sig]<BR>"
-	user << browse(dat, "window=lawchanges;size=800x500")
+	user << browse(HTML_SKELETON(dat), "window=lawchanges;size=800x500")

code/modules/admin/secrets/admin_secrets/show_signalers.dm

@@ -12,4 +12,4 @@
 	var/dat = "<B>Showing last [length(lastsignalers)] signalers.</B><HR>"
 	for(var/sig in lastsignalers)
 		dat += "[sig]<BR>"
-	user << browse(dat, "window=lastsignalers;size=800x500")
+	user << browse(HTML_SKELETON(dat), "window=lastsignalers;size=800x500")