acc: fix volumes/recreate output after JSON formatter change (#5245)

Since #5170 the CLI's JSON output uses the standard `: ` separator (via
`json.MarshalIndent`) rather than the compact `":"` form produced by the
previous `nwidger/jsoncolor` dependency. The acceptance output for
`bundle/resources/volumes/recreate` still captured the compact form for
one `grants get` line and has been failing on UCWS nightlies since #5170
merged. #5227 picked up the same staleness in `TestClustersGet`; this
picks up the missed acceptance output.

This pull request and its description were written by Isaac.

Author: pietern

acceptance/bundle/resources/volumes/recreate/output.txt

@@ -28,7 +28,7 @@ Deployment complete!
 {
   "privilege_assignments": [
     {
-      "principal":"account users",
+      "principal": "account users",
       "privileges": [
         "WRITE_VOLUME"
       ]