refactor(connector-corda): de-dockerize openapi generator invoke

Why though? Because if you are building the project during the
building of the supply chain app example container image, then
the "generate-server" script of the corda connector was failing
due to a running docker daemon not being present in the image
at build time (even with the docker-in-docker base image because
that also only has a docker daemon running at runtime of the
container not at build time).

Signed-off-by: Peter Somogyvari <peter.somogyvari@accenture.com>

packages/cactus-plugin-ledger-connector-corda/package.json

@@ -13,7 +13,7 @@
   ],
   "scripts": {
     "generate-sdk": "openapi-generator generate --input-spec src/main/json/openapi.json -g typescript-axios -o ./src/main/typescript/generated/openapi/typescript-axios/",
-    "generate-server": "docker run --user \"$(id -u):$(id -g)\" --rm -v \"${PWD}:/local\" openapitools/openapi-generator-cli:v5.0.0 generate -i /local/src/main/json/openapi.json -g kotlin-spring -o /local/src/main-server/kotlin/gen/kotlin-spring/ -c /local/src/main-server/openapi-generator-config.yaml",
+    "generate-server": "openapi-generator generate --input-spec src/main/json/openapi.json -g kotlin-spring -o ./src/main-server/kotlin/gen/kotlin-spring/ -c ./src/main-server/openapi-generator-config.yaml",
     "pretsc": "npm-run-all generate-sdk generate-server",
     "tsc": "tsc --project ./tsconfig.json",
     "watch": "npm-watch",