fix wrong indentation

5 jobs for improve_ci in 13 minutes and 10 seconds
Status Job ID Name Coverage
  Analyze
passed #79328319
dartanalyze

00:06:01

passed #79328318
dartfmt

00:06:01

 
  Test
passed #79328321
test_in_chrome

00:07:08

passed #79328322
test_in_firefox

00:07:07

passed #79328320
test_in_vm

00:03:20