Udpate db_universal_compaction_test according to PR #3970 (#3995)

Summary:
The SST file sizes changed slightly after the improvement of PR #3970
which reduces the size of the properties block. Before PR #3970 a size
ratio compaction included all of the first four flushed files but it
only includes two files after. We increase the size_ratio universal
compaction option to make that compaction include all four files again.
Closes https://github.com/facebook/rocksdb/pull/3995

Differential Revision: D8426925

Pulled By: fgwu

fbshipit-source-id: 1429c38672e9f4fb4d4881fd4b06db45c4861d62

db/db_universal_compaction_test.cc

@@ -1363,7 +1363,7 @@ TEST_P(DBTestUniversalCompaction, UniversalCompactionCFPathUse) {
   options.memtable_factory.reset(
       new SpecialSkipListFactory(KNumKeysByGenerateNewFile - 1));
   options.compaction_style = kCompactionStyleUniversal;
-  options.compaction_options_universal.size_ratio = 5;
+  options.compaction_options_universal.size_ratio = 10;
   options.write_buffer_size = 111 << 10;  // 114KB
   options.arena_block_size = 4 << 10;
   options.level0_file_num_compaction_trigger = 2;