remove redundant assignment code for member state (#9665)

Summary:
Remove redundant assignment code for member `state` in the constructor of `ImmutableDBOptions`.
There are two identical and redundant statements `stats = statistics.get();` in lines 740 and 748 of the code.
This commit removed the line 740.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9665

Reviewed By: ajkr

Differential Revision: D34686649

Pulled By: riversand963

fbshipit-source-id: 8f246ece382b6845528f4e2c843ce09bb66b2b0f

options/db_options.cc

@@ -737,7 +737,6 @@ ImmutableDBOptions::ImmutableDBOptions(const DBOptions& options)
       checksum_handoff_file_types(options.checksum_handoff_file_types),
       lowest_used_cache_tier(options.lowest_used_cache_tier),
       compaction_service(options.compaction_service) {
-  stats = statistics.get();
   fs = env->GetFileSystem();
   if (env != nullptr) {
     clock = env->GetSystemClock().get();