use --message-limit in table output

this changes the default width from 80 to 100

lib/brakeman/util.rb

@@ -388,7 +388,7 @@ module Brakeman::Util
                           Brakeman.load_brakeman_dependency 'highline'
                           ::HighLine.new.terminal_size[0]
                         else
-                          80
+                          @tracker.options[:message_limit]
                         end
     lines = str.lines