samples: wifi: radio_test: single_domain: fix tags format

yaml list.

Signed-off-by: Piotr Kosycarz <[email protected]>

Author: nordic-piks

samples/wifi/radio_test/single_domain/sample.yaml

@@ -12,4 +12,7 @@ tests:
       - nrf54l15dk/nrf54l15/cpuapp
     platform_allow:
       - nrf54l15dk/nrf54l15/cpuapp
-    tags: ci_build sysbuild ci_samples_wifi
+    tags:
+      - ci_build
+      - sysbuild
+      - ci_samples_wifi