Fix Rubocop offenses

Author: MrSerth

app/controllers/labels_controller.rb

@@ -15,9 +15,7 @@ def update
     end
   end
 
-  def destroy
-    @label.destroy
-  end
+  delegate :destroy, to: :@label
 
   def merge # rubocop:disable Metrics/AbcSize
     label_ids = params[:label_ids] || []

app/policies/task_contribution_policy.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class TaskContributionPolicy < ApplicationPolicy
+  delegate :base, :suggestion, to: :@record
+
   def initialize(user, record)
     super
     @record = record.task_contribution if record.is_a?(Task)
@@ -10,14 +12,6 @@ def task_contribution
     @record
   end
 
-  def suggestion
-    @record.suggestion
-  end
-
-  def base
-    @record.base
-  end
-
   %i[create? new?].each do |action|
     define_method(action) do
       Pundit.policy(@user, base).contribute?