[BUG] [Qt5][client] Initialize contentCompression variables

[natanlaverde]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?

Description

When contentCompression is not enabled, the variables isRequestCompressionEnabled and isResponseCompressionEnabled in HttpRequestWorker are not being initialized.
Without initialization the compress function could be called and the request content could be an empty QByteArray instead of original request body.

openapi-generator version

4.3.1-SNAPSHOT

OpenAPI declaration file content or url

N/A.

Command line used for generation

java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate \
  -i https://raw.githubusercontent.com/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml \
  -g cpp-qt5-client \
  -o /tmp/client/petstore/cpp-qt5-client

Steps to reproduce

Just generate without contentCompression option.

Related issues/PRs

N/A

Suggest a fix

Just initialize the variables isRequestCompressionEnabled and isResponseCompressionEnabled in HttpRequestWorker Class with default value false.

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