Fix ConcurrentModificationException in WatchQueueReader #3016
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This addresses https://community.openhab.org/t/openhab-3-3-milestone-discussion/132715/220
@openhab/core-maintainers: I don't know how likely this race condition is to happen - please decide whether you consider it critical and merge it for 3.3 or leave it for later.
Signed-off-by: Kai Kreuzer kai@openhab.org