Update PrestoS3FileSystem.java

[ShefronYudy]

The LOG.debug("destination does not exist"); should be log.debug("destination does not exist");， because the LOG is parent FileSystem's reference.

What type of PR is this?

bug

What does this PR do / why do we need it:

When use LOG to print some messages, The log class of log message is not the current PrestoS3FileSystem, but the parent FileSystem.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewers:

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83e1395 | Update PrestoS3FileSystem.java

The LOG.debug("destination does not exist"); should be log.debug("destination does not exist");， because the LOG is parent FileSystem's reference.

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