fix table in card

[adrian-bobev]

This PR corrects slot names for the table (row and cells).

No need to manually add slot attribute (only data-ui5-slot and the framework manages the slot attribute properly).

Now in the

<ui5-table-cell data-ui5-slot="cells"></ui5-table-cell>

the data-ui5-slot should be specified. In the next release the cells slot will be default and the table-cell could be used like this:

<ui5-table-cell></ui5-table-cell>

You can check this issue for more information

[adrian-bobev]

We implemented a warning from the Web Components to tell you if you use a wrong data-ui5-slot instead of throwing an error.

This is the PR