Formatter should handle [{...}] better

jsonnet fmt changed the following code from:

```
volumeMounts: [
{
name: "deployment-config",
mountPath:
if cluster.isLocal then
"/box/deployment-config"
else
"/box"
,
},
],
```

to:

```
volumeMounts: [
{
name: "deployment-config",
mountPath:
if cluster.isLocal then
"/box/deployment-config"
else
"/box",
},
],
```

which is mis-indented. My personal taste would have had the whole thing turned to:

```
volumeMounts: [{
name: "deployment-config",
mountPath:
if cluster.isLocal then
"/box/deployment-config"
else
"/box",
}],
```