bug: fix annotation bug (#1887)

#### What type of PR is this?

<!--
Add one of the following kinds:
/kind bug
/kind cleanup
/kind documentation
/kind feature
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#### What this PR does / why we need it:

When supplying a label in the compose file, it should stay in the output
too.

#### Which issue(s) this PR fixes:
<!--
*Automatically closes linked issue when PR is merged.
Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
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Fixes https://github.com/kubernetes/kompose/issues/1885

#### Special notes for your reviewer:

Signed-off-by: Charlie Drage <charlie@charliedrage.com>

script/test/fixtures/label/compose.yaml

@@ -0,0 +1,7 @@
+services:
+  app:
+    image: node:18-alpine
+    ports:
+      - 3000:3000
+    labels:
+      - "com.example.label=foo"

script/test/fixtures/label/output-k8s.yaml

@@ -0,0 +1,47 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  annotations:
+    com.example.label: foo
+  labels:
+    io.kompose.service: app
+  name: app
+spec:
+  ports:
+    - name: "3000"
+      port: 3000
+      targetPort: 3000
+  selector:
+    io.kompose.service: app
+
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  annotations:
+    com.example.label: foo
+  labels:
+    io.kompose.service: app
+  name: app
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      io.kompose.service: app
+  template:
+    metadata:
+      annotations:
+        com.example.label: foo
+      labels:
+        io.kompose.network/label-default: "true"
+        io.kompose.service: app
+    spec:
+      containers:
+        - image: node:18-alpine
+          name: app
+          ports:
+            - containerPort: 3000
+              protocol: TCP
+      restartPolicy: Always
+