Add id to the text input field when editing the template.

Hi.
I use a non-white background and another background color for emphasis, for example for the text input field. I had noticed that nonetheless when you edited the card layout, that text input field was shown with a white background.

So i added the missing `id` attribute. Like this, the effect of styling to it can be seen in the layout editor.

I also removed what looks like an extra '<center></center>'. That is added three lines later.