mintUpdate.py: Fix auto-refresh loop race condition.

The refresh() function is an _idle function, and being called from
the auto-refresh thread. Because of this, the thread ends up looping
before the 'refresh-last-run' value can be updated, causing another
refresh to occur 1 minute later. This happens for every periodic
refresh.

ref: #1017

mintUpdate.py: Fix auto-refresh loop race condition.

The refresh() function is an _idle function, and being called from
the auto-refresh thread. Because of this, the thread ends up looping
before the 'refresh-last-run' value can be updated, causing another
refresh to occur 1 minute later. This happens for every periodic
refresh.

ref: #1017

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