runcommand.t: stop dumping the json

Dependencies

• [2] 3AKZKWCR RunCommand: Test
• [3] Z4AMS3T7 RunCommand: emit the `finished` field as a boolean
• [4] 2AM7IAS5 Tighten up 'should exit with return code'

Change contents

• edit in t/plugins/runcommand.t at line 49
  [2.2644]→[2.2644:2683](∅→∅)
  − use Data::Dumper;

  − print Dumper($dat);

  −