opt standalone into dump-guest-state too

Author: gjcolombo

bin/propolis-standalone/Cargo.toml

@@ -40,5 +40,5 @@ tar.workspace = true
 uuid.workspace = true
 
 [features]
-default = []
+default = ["propolis/dump-guest-state"]
 crucible = ["propolis/crucible-full", "propolis/oximeter", "crucible-client-types"]