Do not drop previous tables

Author: Rakambda

src/main/resources/db/migration/V3_5_0__quartz.sql

@@ -7,18 +7,6 @@
 # org.quartz.jobStore.driverDelegateClass = org.quartz.impl.jdbcjobstore.StdJDBCDelegate
 #
 
-DROP TABLE IF EXISTS QRTZ_FIRED_TRIGGERS;
-DROP TABLE IF EXISTS QRTZ_PAUSED_TRIGGER_GRPS;
-DROP TABLE IF EXISTS QRTZ_SCHEDULER_STATE;
-DROP TABLE IF EXISTS QRTZ_LOCKS;
-DROP TABLE IF EXISTS QRTZ_SIMPLE_TRIGGERS;
-DROP TABLE IF EXISTS QRTZ_SIMPROP_TRIGGERS;
-DROP TABLE IF EXISTS QRTZ_CRON_TRIGGERS;
-DROP TABLE IF EXISTS QRTZ_BLOB_TRIGGERS;
-DROP TABLE IF EXISTS QRTZ_TRIGGERS;
-DROP TABLE IF EXISTS QRTZ_JOB_DETAILS;
-DROP TABLE IF EXISTS QRTZ_CALENDARS;
-
 CREATE TABLE QRTZ_JOB_DETAILS
   (
     SCHED_NAME VARCHAR(120) NOT NULL,