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
-->

#### 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)`.
-->

Fixes https://github.com/kubernetes/kompose/issues/1885

#### Special notes for your reviewer:

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

script/test/cmd/tests.sh

@@ -386,3 +386,8 @@ os_cmd="kompose -f $KOMPOSE_ROOT/script/test/fixtures/envvars-with-status/compos
 os_output="$KOMPOSE_ROOT/script/test/fixtures/envvars-with-status/output-os.yaml"
 convert::expect_success "$k8s_cmd" "$k8s_output" || exit 1
 convert::expect_success "$os_cmd" "$os_output" || exit 1
+
+# Test label in compose.yaml appears in the output annotation
+k8s_cmd="kompose -f $KOMPOSE_ROOT/script/test/fixtures/label/compose.yaml convert --stdout --with-kompose-annotation=false"
+k8s_output="$KOMPOSE_ROOT/script/test/fixtures/label/output-k8s.yaml"
+convert::expect_success "$k8s_cmd" "$k8s_output" || exit 1