Fix Rubocop offenses in local holdouts spec files

- Fix Layout/SpaceInsideHashLiteralBraces in datafile_project_config_spec.rb
- Fix Lint/UselessAssignment by removing unused feature_flag variable in decision_service_holdout_spec.rb

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Mat001

spec/config/datafile_project_config_spec.rb

@@ -1955,7 +1955,7 @@ def build_datafile(experiments: [], rollouts: [], feature_flags: [])
       end
 
       it 'returns true for holdout with explicit nil includedRules' do
-        holdout = { 'id' => 'test', 'key' => 'test', 'includedRules' => nil }
+        holdout = {'id' => 'test', 'key' => 'test', 'includedRules' => nil}
         expect(config_with_local_holdouts.holdout_global?(holdout)).to be true
       end
 
@@ -2013,8 +2013,8 @@ def build_datafile(experiments: [], rollouts: [], feature_flags: [])
                   'status' => 'Running',
                   'audiences' => [],
                   'includedRules' => ['some_rule_id'],
-                  'variations' => [{ 'id' => 'v1', 'key' => 'holdout', 'featureEnabled' => false }],
-                  'trafficAllocation' => [{ 'entityId' => 'v1', 'endOfRange' => 10_000 }]
+                  'variations' => [{'id' => 'v1', 'key' => 'holdout', 'featureEnabled' => false}],
+                  'trafficAllocation' => [{'entityId' => 'v1', 'endOfRange' => 10_000}]
                 }
               ]
             )

spec/decision_service_holdout_spec.rb

@@ -864,7 +864,6 @@
         # Spy on get_variation to verify it is NOT called (audience/traffic skipped)
         allow(decision_service_local).to receive(:get_variation).and_call_original
 
-        feature_flag = config_with_local_holdouts.feature_flag_key_map['boolean_feature']
         user_ctx = project_with_local_holdouts.create_user_context('test_user', {})
         user_profile_tracker = Optimizely::UserProfileTracker.new('test_user', nil, spy_logger)
 
@@ -904,7 +903,6 @@
         # Track that get_variation (regular rule evaluation) is called
         allow(decision_service_local).to receive(:get_variation).and_call_original
 
-        feature_flag = config_with_local_holdouts.feature_flag_key_map['boolean_feature']
         user_ctx = project_with_local_holdouts.create_user_context('test_user', {})
         user_profile_tracker = Optimizely::UserProfileTracker.new('test_user', nil, spy_logger)