Tests: versioning.derived fix for buildbot

mysql-test/suite/versioning/r/derived.result

@@ -215,5 +215,5 @@ select y from t2 for system_time as of @t1;
 x
 1
 10
-drop database test;
-create database test;
+drop table t1, t2;
+drop view vt1, vt2;

mysql-test/suite/versioning/t/derived.test

@@ -151,5 +151,5 @@ select y from t2 for system_time as of @t1;
 select x from t1 for system_time as of @t0 union
 select y from t2 for system_time as of @t1;
 
-drop database test;
-create database test;
+drop table t1, t2;
+drop view vt1, vt2;