functional-tests: Reduce graphupdated-delay during miner tests
The Tracker Store notifies all of its clients about changes in the store using the GraphUpdated signal. This can contain a lot of data and so to avoid flooding the D-Bus connection it is rate limited to one per 1000ms. The miner tests spend a lot of time waiting for updates to happen, so this 1000ms timeout causes a big slowdown. Reducing it to 100ms causes the 310-fts-basic.py test to run in 30 seconds on my machine where previously it took 50 seconds.
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