fixed test spec and remove uncessary test files

app/controllers/api/restaurant/zone_controller.rb

@@ -1,4 +0,0 @@
-class Api::Restaurant::ZoneController < ApplicationController
-  def index
-  end
-end

app/controllers/api/restaurant/zones_controller.rb

@@ -0,0 +1,5 @@
+class Api::Restaurant::ZonesController < ActionController::API
+  def index
+      render json: Zone.where("is_active = true")
+  end
+end

app/views/api/restaurant/zone/index.html.erb

@@ -1,2 +0,0 @@
-<h1>Api::Restaurant::Zone#index</h1>
-<p>Find me in app/views/api/restaurant/zone/index.html.erb</p>