[openstreetmap/openstreetmap-website] Fix user blocks short duration display issues (#3216)

[Andy Allan]

This PR fixes the two issues described in #3210 which, although technically different, can be taken together.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/3216

-- Commit Summary --

  * Ensure that short duration blockss are shown as '0 hours'
  * Fix case when user block durations are slightly negative

-- File Changes --

    M app/helpers/user_blocks_helper.rb (4)
    M test/helpers/user_blocks_helper_test.rb (20)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/3216.patch
https://github.com/openstreetmap/openstreetmap-website/pull/3216.diff

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