fix(validation-messages): fix invalid own property check

[mateusz-dobrowolski-va]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/valueadd-poland/ng-packages/blob/master/CONTRIBUTING.md#git-guidelines
• Tests for the changes have been added (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ x ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Error messages are not displayed

Issue Number: N/A

What is the new behavior?

Error messages are displayed

Does this PR introduce a breaking change?

[ ] Yes
[ x ] No

Other information