use existing user in FollowButtonComponent test

spec/components/follow_button_component_spec.rb

@@ -3,16 +3,14 @@
 require "rails_helper"
 
 RSpec.describe FollowButtonComponent, type: :component do
-  let(:user) { create :user }
+  let(:follower) { create(:user) }
+  let(:target) { create(:creator) }
 
   before do
-    sign_in(user)
+    sign_in(follower)
     allow(SiteSettings).to receive(:multiuser_enabled?).and_return(true)
   end
 
-  let(:follower) { create(:user) }
-  let(:target) { create(:creator) }
-
   context "when the follower is not following the target" do
     let(:button) {
       allow(follower).to receive(:following?).with(target).and_return false