fix reaction deletion bug and clean up controller

Turns out the strange error where it would delete
the wrong reaction occurred because I forgot to
pass the emoji name to the query, which resulted
in the database deleting the first reaction it
found.  Also, this removes the unused set_reaction
callback and includes the Authorization module for
the status reactions controller.

app/controllers/api/v1/statuses/reactions_controller.rb

@@ -1,11 +1,11 @@
 # frozen_string_literal: true
 
 class Api::V1::Statuses::ReactionsController < Api::BaseController
+  include Authorization
+
   before_action -> { doorkeeper_authorize! :write, :'write:favourites' }
   before_action :require_user!
-
   before_action :set_status
-  before_action :set_reaction, except: :update
 
   def update
     ReactService.new.call(current_account, @status, params[:id])
@@ -13,16 +13,12 @@ class Api::V1::Statuses::ReactionsController < Api::BaseController
   end
 
   def destroy
-    UnreactService.new.call(current_account, @status)
+    UnreactService.new.call(current_account, @status, params[:id])
     render_empty
   end
 
   private
 
-  def set_reaction
-    @reaction = @status.status_reactions.where(account: current_account).find_by!(name: params[:id])
-  end
-
   def set_status
     @status = Status.find(params[:status_id])
   end

app/services/unreact_service.rb

@@ -3,8 +3,8 @@
 class UnreactService < BaseService
   include Payloadable
 
-  def call(account, status)
-    reaction = StatusReaction.find_by(account: account, status: status)
+  def call(account, status, name)
+    reaction = StatusReaction.find_by(account: account, status: status, name: name)
     return if reaction.nil?
 
     reaction.destroy!