fix: syntax errors in kube-state-metrics.libsonnet

Previously customizing kube-prometheus [1] failed with the following
error.

    ❯ ./build.sh example.jsonnet
    + set -o pipefail
    + rm -rf manifests
    + mkdir -p manifests/setup
    + jsonnet -J vendor -m manifests example.jsonnet
    + xargs '-I{}' sh -c 'cat {} | gojsontoyaml > {}.yaml' -- '{}'
    RUNTIME ERROR: vendor/github.com/kubernetes/kube-state-metrics/jsonnet/kube-state-metrics/kube-state-metrics.libsonnet:392:21-22 Expected token OPERATOR but got "{"
            vendor/kube-prometheus/components/kube-state-metrics.libsonnet:51:19-124        function <anonymous>
            vendor/kube-prometheus/main.libsonnet:136:21-64 object <anonymous>
            vendor/kube-prometheus/platforms/platforms.libsonnet:37:22-40   +:
            example.jsonnet:33:90-109       thunk from <$>
            <std>:1539:24-25        thunk from <function <anonymous>>
            <std>:1539:5-33 function <anonymous>
            example.jsonnet:33:73-110       $
            example.jsonnet:33:1-112
            example.jsonnet:33:1-112
            During evaluation

With this patch, the build succeeds:

    ❯ bash build.sh example.jsonnet ; echo $?
    + set -o pipefail
    + rm -rf manifests
    + mkdir -p manifests/setup
    + jsonnet -J vendor -m manifests example.jsonnet
    + xargs '-I{}' sh -c 'cat {} | gojsontoyaml > {}.yaml' -- '{}'
    + find manifests -type f '!' -name '*.yaml' -delete
    + rm -f kustomization
    0

[1]: https://github.com/prometheus-operator/kube-prometheus/blob/main/docs/customizing.md

jsonnet/kube-state-metrics/kube-state-metrics.libsonnet

@@ -389,15 +389,15 @@
             labels: {'app.kubernetes.io/name': shardksmname}
           },
           spec: {
-            selector{
-              matchLabels: {app.kubernetes.io/name': shardksmname}
-            }
+            selector: {
+              matchLabels: {'app.kubernetes.io/name': shardksmname}
+            },
             template: {
               metadata: {
                 labels: {
-                  app.kubernetes.io/name': shardksmname
+                  'app.kubernetes.io/name': shardksmname
                 }
-              }
+              },
               spec: {
                 containers: [c],
               },
@@ -475,5 +475,3 @@
     clusterRoleBinding: ksm.clusterRoleBinding,
   },
 }
-
-