blocks investigate log access without R_SENSITIVE (#15573)

* Update admin_verbs.dm

* Update admin_verbs.dm

* Update sql_message_system.dm

code/modules/admin/sql_message_system.dm

@@ -369,6 +369,8 @@
 	qdel(query_find_message_secret)
 
 /proc/browse_messages(type, target_ckey, index, linkless = FALSE, filter, agegate = FALSE)
+	if(!check_rights(R_SENSITIVE))
+		return
 	if(!SSdbcore.Connect())
 		to_chat(usr, "<span class='danger'>Failed to establish database connection.</span>", confidential = TRUE)
 		return