Per-user reblog hiding implementation/fixes/tests

Note that this will only hide/show *future* reblogs by a user, and does
nothing to remove/add reblogs that are already in the timeline. I don't
think that's a particularly confusing behavior, and it's a lot easier
to implement (similar to mutes, I believe).

spec/controllers/api/v1/accounts/relationships_controller_spec.rb

@@ -32,7 +32,7 @@ describe Api::V1::Accounts::RelationshipsController do
         json = body_as_json
 
         expect(json).to be_a Enumerable
-        expect(json.first[:following]).to be true
+        expect(json.first[:following]).to be_truthy
         expect(json.first[:followed_by]).to be false
       end
     end
@@ -51,7 +51,7 @@ describe Api::V1::Accounts::RelationshipsController do
 
         expect(json).to be_a Enumerable
         expect(json.first[:id]).to eq simon.id.to_s
-        expect(json.first[:following]).to be true
+        expect(json.first[:following]).to be_truthy
         expect(json.first[:followed_by]).to be false
         expect(json.first[:muting]).to be false
         expect(json.first[:requested]).to be false

spec/controllers/api/v1/accounts_controller_spec.rb

@@ -31,10 +31,10 @@ RSpec.describe Api::V1::AccountsController, type: :controller do
         expect(response).to have_http_status(:success)
       end
 
-      it 'returns JSON with following=true and requested=false' do
+      it 'returns JSON with following=truthy and requested=false' do
         json = body_as_json
 
-        expect(json[:following]).to be true
+        expect(json[:following]).to be_truthy
         expect(json[:requested]).to be false
       end
 
@@ -50,11 +50,11 @@ RSpec.describe Api::V1::AccountsController, type: :controller do
         expect(response).to have_http_status(:success)
       end
 
-      it 'returns JSON with following=false and requested=true' do
+      it 'returns JSON with following=false and requested=truthy' do
         json = body_as_json
 
         expect(json[:following]).to be false
-        expect(json[:requested]).to be true
+        expect(json[:requested]).to be_truthy
       end
 
       it 'creates a follow request relation between user and target user' do