debezium/dbz#1560 Update lower mining boundary on each pass

Signed-off-by: Chris Cranford <chris@hibernate.org>

Author: Naros

debezium-connector-oracle/src/main/java/io/debezium/connector/oracle/logminer/buffered/BufferedLogMinerStreamingChangeEventSource.java

@@ -173,8 +173,8 @@ else if (!restartRequired) {
                             // beginning, middle, or end of the log. So by updating this value if and only if
                             // the log changes, allows for maximum session reuse.
                             sessionStartScnChanged = true;
-                            sessionStartScn = result.miningSessionStartScn;
                         }
+                        sessionStartScn = result.miningSessionStartScn;
                     }
 
                     readScn = result.readStartScn();