Revert "Merge pull request rails#12990 from vipulnsward/remove_visual…

…izer_param"

This reverts commit 5a19346, reversing
changes made to d82588e.

This argument is being used in the view
https://github.com/rails/rails/blob/5a19346d2855ecb1c791cdef3af92589566d00db/actionpack/lib/action_dispatch/journey/visualizer/index.html.erb#L4

It is being set using the binding
https://github.com/rails/rails/blob/5a19346d2855ecb1c791cdef3af92589566d00db/actionpack/lib/action_dispatch/journey/gtg/transition_table.rb#L108

actionpack/lib/action_dispatch/journey/gtg/transition_table.rb

@@ -69,7 +69,7 @@ def to_svg
           svg.join.sub(/width="[^"]*"/, '').sub(/height="[^"]*"/, '')
         end
 
-        def visualizer(paths)
+        def visualizer(paths, title = 'FSM')
           viz_dir   = File.join File.dirname(__FILE__), '..', 'visualizer'
           fsm_js    = File.read File.join(viz_dir, 'fsm.js')
           fsm_css   = File.read File.join(viz_dir, 'fsm.css')