Project.api_retrieve: set vcs_type

This was overlooked and may be necessary for projects created
with `webdriver_create()`, the main caller of `api_retrieve()`.
10 jobs for !99 with topic/default/api-retrieve in 27 minutes and 43 seconds (queued for 1 second)
latest detached
Status Name Job ID Coverage
  Lint
passed flake8 #253100

00:01:10

 
  Test Heptapod
passed docker-fully-native-inside #253107

00:22:32

passed docker-fully-native-remote-0 #253108

00:21:41

passed docker-fully-native-remote-1 #253109

00:25:05

passed docker-inside #253101

00:24:07

passed docker-native-inside #253104

00:22:25

passed docker-native-remote-0 #253105

00:22:13

passed docker-native-remote-1 #253106

00:26:06

passed docker-remote-0 #253102

00:23:09

passed docker-remote-1 #253103

00:26:31