Remember initial display css value instead of setting always as block

Description

Some components style are broken since the last changes regarding the show() and hide() methods, because every component is now displayed as block. But some components should be displayed as inline-block for example.
This solves the problem,

Job done

Remember the initial value of the css display property, and use it in the show() method.

Definition of Done

For the Developer:

• Code compiles and conforms to defined coding standards (eslint, tsc, prettier).
• If necessary (at the developer's discretion), unit tests have been added for critical parts.
• All unittests run without error.
• Sonar-Scan returns no new issues or security hotspots.
• Documentation has been updated where necessary (see documentation repository).
• Merge-Request contains a few explanations of what was done.
• A Reviewer has been assigned to the Merge-Request.

For the Reviewer:

• New code was reviewed.
• If comments could be added on unclear code, the developer has been informed.
• If unitests could be added in certain places, the developer has been informed.
• Merge-Request was merged on main branch.
• All pipelines work.
• The changes were tested on demo environment.
• Application performance has not been degraded by the modifications.