Edit post redirect

[0xTim]

Fixes an annoying bug where editing a post and then saving would not redirect you to the post but back to the admin page. This PR brings the behaviour in line with post creation

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@dd5e14d). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #28   +/-   ##
=========================================
  Coverage          ?   80.14%           
=========================================
  Files             ?       17           
  Lines             ?     1617           
  Branches          ?        0           
=========================================
  Hits              ?     1296           
  Misses            ?      321           
  Partials          ?        0

Impacted Files	Coverage Δ
...s/SteamPress/Controllers/BlogAdminController.swift	84.63% <100%> (ø)

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