Fix db_bench LITE build recently broken (#6411)

Summary:
A recent change https://github.com/facebook/rocksdb/pull/6386 broke LITE build in a trivial way. Fix it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6411

Test Plan: Run "LITE=1 make all"

Differential Revision: D19871765

fbshipit-source-id: 74f0ad3f8a9d666fbde0da7fd29ba1547a811f77

tools/db_bench_tool.cc

@@ -6936,10 +6936,10 @@ int db_bench_tool(int argc, char** argv) {
   FLAGS_compression_type_e =
     StringToCompressionType(FLAGS_compression_type.c_str());
 
+#ifndef ROCKSDB_LITE
   FLAGS_blob_db_compression_type_e =
     StringToCompressionType(FLAGS_blob_db_compression_type.c_str());
 
-#ifndef ROCKSDB_LITE
   if (!FLAGS_hdfs.empty() && !FLAGS_env_uri.empty()) {
     fprintf(stderr, "Cannot provide both --hdfs and --env_uri.\n");
     exit(1);