Change Details

`make check` `qt/test/test_bitcoin-qt` [x] Run bitcoin for first time with no .bitcoin directory, to see intro screen. [x] Run again with -prune=1000 to see that help text.

`make check` `qt/test/test_bitcoin-qt` [x] Run bitcoin for first time with no .bitcoin directory, to see intro screen. [x] Run again with -prune=1000 to see that prune-related text.

`make check` `qt/test/test_bitcoin-qt` [x] Run bitcoin for first time with no .bitcoin directory, to see intro screen. [x] Run again with -prune=1000 to see that helpprune-related text.