Don't allow changing answers if the poll has started

Just like we did with questions.

app/components/admin/poll/questions/answers/table_actions_component.rb

@@ -0,0 +1,14 @@
+class Admin::Poll::Questions::Answers::TableActionsComponent < ApplicationComponent
+  attr_reader :answer
+  delegate :can?, to: :helpers
+
+  def initialize(answer)
+    @answer = answer
+  end
+
+  private
+
+    def actions
+      [:edit].select { |action| can?(action, answer) }
+    end
+end