Fix "[Rails5] '-1' is not a valid data_store"

spec/models/ci/build_trace_chunk_spec.rb

@@ -57,7 +57,7 @@ describe Ci::BuildTraceChunk, :clean_gitlab_redis_shared_state do
 
     context 'when data_store is others' do
       before do
-        build_trace_chunk.send(:write_attribute, :data_store, -1)
+        build_trace_chunk.send(:write_attribute, :data_store, 999)
       end
 
       it { expect { subject }.to raise_error('Unsupported data store') }