fix(list): secondary item container expected a height of 100%

[devversion]

• The height of 100% for the secondary item container was depending on its parent DOM structure. So in some weird cases, the secondary item container was reserving 100% height of the screen.

This property even became unnecessary, because now the secondary items are expecting its size correctly and will fill the remaining space by the auto margin.

Thoroughly tested the List Demo, Divider Demo and a few User-specified list layouts.

Fixes #8094.

[scriptsure]

i think this is exactly issue i am currently having in my main body:

`

<ui-view name="main-nav"></ui-view>
<ui-view flex layout-fill layout="column" name="content" ></ui-view>

`

The main-nav is just a md-toolbar... and the content is everything below the main navigation. what is happening is that the layout-fill on the content is trying to use 100%. Once computed of course the height equals the same height of the BODY. Thus, we get a scrollbar in the browser!

is this fix going to be committed soon?

Thanks

[devversion]

Fix combined into #8075