Update test cases at 1000-byte boundaries (#1439)
Update test cases at 1000-byte boundaries (#1439)

Update test cases for 1,000 byte TX boundaries; in 1.10 and before the fees for these were rolled up to the next DOGE, however that results in incorrect fees because the UI currently uses 1,000 bytes as a predicted size. This updates the tests to match new behaviour in 1.14.

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