qa: Updated pruning test to reflect changes in ca3a26df
qa: Updated pruning test to reflect changes in ca3a26df

The pruning test was outdated in that it was written to test BTC's 288
MIN_BLOCKS_TO_KEEP and 550 MiB MIN_DISK_SPACE_FOR_BLOCK_FILES.
To fix we recalculate arithmetic to accomodate our corresponding 1440
MIN_BLOCKS_TO_KEEP and 2200 MiB MIN_DISK_SPACE_FOR_BLOCK_FILES which
is representative as minimum val we can pass to configure a node to
automatically prune: -prune=2200.

Copied mine_large_blocks from 03d6d238 to speed up the test.

Separated the manual testing from the main test because the values
depend on Bitcoin configuration.

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