Fix most rubocop issues (#2165)

* Run rubocop --autocorrect on app/, config/ and lib/, also manually fix some remaining style issues

* Run rubocop --autocorrect-all on db/

* Run rubocop --autocorrect-all on `spec/` and fix remaining issues

spec/models/public_feed_spec.rb

@@ -64,7 +64,7 @@ RSpec.describe PublicFeed, type: :model do
         end
 
         it 'does not include local-only statuses' do
-          expect(subject).not_to include(local_only_status.id)
+          expect(subject).to_not include(local_only_status.id)
         end
       end
 
@@ -80,12 +80,14 @@ RSpec.describe PublicFeed, type: :model do
         end
 
         it 'does not include local-only statuses' do
-          expect(subject).not_to include(local_only_status.id)
+          expect(subject).to_not include(local_only_status.id)
         end
       end
     end
 
     context 'without local_only option but allow_local_only' do
+      subject { described_class.new(viewer, allow_local_only: true).get(20).map(&:id) }
+
       let(:viewer) { nil }
 
       let!(:local_account)  { Fabricate(:account, domain: nil) }
@@ -94,8 +96,6 @@ RSpec.describe PublicFeed, type: :model do
       let!(:remote_status)  { Fabricate(:status, account: remote_account) }
       let!(:local_only_status) { Fabricate(:status, account: local_account, local_only: true) }
 
-      subject { described_class.new(viewer, allow_local_only: true).get(20).map(&:id) }
-
       context 'without a viewer' do
         let(:viewer) { nil }
 
@@ -108,7 +108,7 @@ RSpec.describe PublicFeed, type: :model do
         end
 
         it 'does not include local-only statuses' do
-          expect(subject).not_to include(local_only_status.id)
+          expect(subject).to_not include(local_only_status.id)
         end
       end
 
@@ -147,7 +147,7 @@ RSpec.describe PublicFeed, type: :model do
         end
 
         it 'does not include local-only statuses' do
-          expect(subject).not_to include(local_only_status.id)
+          expect(subject).to_not include(local_only_status.id)
         end
       end