Fixed testcase check failure after db938.test

storage/tokudb/mysql-test/tokudb_bugs/r/db938.result

@@ -32,3 +32,4 @@ set session tokudb_analyze_time = @orig_time;
 set global tokudb_cardinality_scale_percent = @orig_scale_percent;
 set session default_storage_engine = @orig_default_storage_engine;
 set global tokudb_debug_pause_background_job_manager = @orig_pause_background_job_manager;
+set DEBUG_SYNC='reset';

storage/tokudb/mysql-test/tokudb_bugs/t/db938.test

@@ -74,3 +74,4 @@ set session tokudb_analyze_time = @orig_time;
 set global tokudb_cardinality_scale_percent = @orig_scale_percent;
 set session default_storage_engine = @orig_default_storage_engine;
 set global tokudb_debug_pause_background_job_manager = @orig_pause_background_job_manager;
+set DEBUG_SYNC='reset';