Fixed timestamped logger cutting off last character (fixes rapid7#8597)

Author: dirkjanm

lib/rex/logging/sinks/timestamp_flatfile.rb

@@ -13,7 +13,7 @@ class TimestampFlatfile < Flatfile
 
   def log(sev, src, level, msg, from) # :nodoc:
     return unless msg.present?
-    msg = msg.chop.gsub(/\x1b\[[0-9;]*[mG]/,'').gsub(/[\x01-\x02]/, " ")
+    msg = msg.gsub(/\x1b\[[0-9;]*[mG]/,'').gsub(/[\x01-\x02]/, ' ').gsub(/\s+$/,'')
     fd.write("[#{get_current_timestamp}] #{msg}\n")
     fd.flush
   end