[Azure] Stop using `-r junit` to executing `xcpretty` on watchOS

azure-pipelines.yml

@@ -46,7 +46,7 @@ jobs:
     - script: >
         set -o pipefail &&
         xcodebuild $XCODE_FLAGS build -sdk watchsimulator -destination "name=Apple Watch Series 3 - 38mm" |
-        xcpretty -r junit -o build/reports/xcodebuild-watchOS.xml
+        xcpretty
       displayName: build on watchOS
       condition: succeededOrFailed()
     - script: >