[Angular] Sonar: fix code smells

[qmonmert]

Fix some code smells:

• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelIeBpr3QB7K3jBmyI&resolved=false&severities=MINOR&types=CODE_SMELL
• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelId_5r3QB7K3jBmyD&resolved=false&severities=MINOR&types=CODE_SMELL
• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelIeR9r3QB7K3jBmyl&resolved=false&severities=MINOR&types=CODE_SMELL
• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelIeIjr3QB7K3jBmyV&resolved=false&severities=MINOR&types=CODE_SMELL
• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelIeYYr3QB7K3jBmzA&resolved=false&severities=MINOR&types=CODE_SMELL
• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelIeUzr3QB7K3jBmyq&resolved=false&severities=MINOR&types=CODE_SMELL
• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelIeW2r3QB7K3jBmyw&resolved=false&severities=MINOR&types=CODE_SMELL
• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelIeJ8r3QB7K3jBmyZ&resolved=false&severities=MINOR&types=CODE_SMELL
• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelIeZHr3QB7K3jBmzD&resolved=false&severities=MINOR&types=CODE_SMELL
• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelIeUDr3QB7K3jBmyp&resolved=false&severities=MINOR&types=CODE_SMELL
• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelIeBEr3QB7K3jBmyH&resolved=false&severities=MINOR&types=CODE_SMELL
• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelIeDFr3QB7K3jBmyM&resolved=false&severities=MINOR&types=CODE_SMELL
• https://sonarcloud.io/project/issues?id=jhipster-sample-application&open=AXelIeEQr3QB7K3jBmyP&resolved=false&severities=MINOR&types=CODE_SMELL

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• All continuous integration tests are green
• Tests are added where necessary
• jhipster-online was updated if necessary
• Documentation is added/updated where necessary
• Coding Rules & Commit Guidelines as per our CONTRIBUTING.md document are followed

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