fix: unset bind-all-interfaces on empty value

`dokku network:set --global bind-all-interfaces` (no value) wrote the literal string `false` to the property file instead of unsetting it, so external tooling could not distinguish "explicitly set to default" from "not set". Drop the empty-to-`false` coercion in `CommandSet` so the empty-value path reaches `PropertyDelete` like every other property, and remove the unconditional `TriggerPostCreate` write so new apps consult the global value before falling back to the `"false"` computed default.

plugins/network/src/triggers/triggers.go

@@ -82,9 +82,6 @@ func main() {
 		phase := flag.Arg(3)
 		processType := flag.Arg(4)
 		err = network.TriggerPostContainerCreate(containerType, containerID, appName, phase, processType)
-	case "post-create":
-		appName := flag.Arg(0)
-		err = network.TriggerPostCreate(appName)
 	case "post-delete":
 		appName := flag.Arg(0)
 		err = network.TriggerPostDelete(appName)