(maint) fix npm run watch

This is a regression from
cake-build#731
where everything will work fine, if node_modules does
not exist. However, if it does exist the non-zero exit code
will propagate and prevent tsc from running.
By adding a second, "parallel" command to ensureCi
the exit code of that script will always be zero and thus
never prevent tsc from running.

package.json

@@ -622,7 +622,7 @@
     "watch": "npm run ensureCi && tsc -watch -p ./",
     "test": "npm run compile && node ./out/test/runTest.js",
     "depcheck": "depcheck",
-    "ensureCi": "node -e \"const fs=require('fs'); if (fs.existsSync('./node_modules/')) { process.exit(123); }\" && npm ci"
+    "ensureCi": "(node -e \"const fs=require('fs'); if (fs.existsSync('./node_modules/')) { process.exit(123); }\" && npm ci) & echo 'ensured.'"
   },
   "dependencies": {
     "adm-zip": "^0.5.9",