Fixed issue where time_partitioning settings were overridden when table name contains partition decorator

Author: t3t5u

lib/embulk/output/bigquery.rb

@@ -244,7 +244,7 @@ def self.configure(config, schema, task_count)
           if task['range_partitioning']
             raise ConfigError.new "Partition decorators(`#{task['table']}`) don't support `range_partition`"
           end
-          task['time_partitioning'] = {'type' => 'DAY'}
+          task['time_partitioning'] ||= {'type' => 'DAY'}
         end
 
         if task['range_partitioning']