Fix runtime-only plugin invocation

Author: kateinoigakukun

.github/workflows/test.yml

@@ -272,7 +272,7 @@ jobs:
 
           cd "$runtime_view/Examples/ActorOnWebWorker"
 
-          swift package --verbose ${SWIFT_PACKAGE_FLAGS} --build-system native --package JavaScriptKit \
+          swift package --verbose ${SWIFT_PACKAGE_FLAGS} --build-system native \
             --swift-sdk "${SWIFT_SDK_ID_wasm32_unknown_wasip1_threads:-${SWIFT_SDK_ID:-wasm32-unknown-wasip1-threads}}" \
             plugin --allow-writing-to-package-directory \
             js --use-cdn --output ./Bundle -c release 2>&1 | tee plugin-build.log