Change status of Match to only represent being finished

The winner will be a attribute of the Match instead of something
that is written in its status.

app/controllers/matches_controller.rb

@@ -15,7 +15,7 @@ class MatchesController < ApplicationController
     new_state = match_params['state']
     if new_state == 'finished'
       # implement logic to move the winning team into the next stage
-      match_params['state'] = 'team1_won' # or 'team2_won' or 'undecided'
+      match_params['state'] = 'finished' # or 'team2_won' or 'undecided'
       render json: {}, status: :not_implemented
     end
     if @match.update(match_params)

app/models/match.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class Match < ApplicationRecord
-  enum state: %i[single_team not_ready not_started in_progress team1_won team2_won undecided]
+  enum state: %i[single_team not_ready not_started in_progress finished undecided]
 
   belongs_to :stage, optional: true
   belongs_to :group, optional: true