in-media lane Automation Items should resize like Free Item Position mode

[mccrabney]

currently, multiple parameter AIs shown in media lanes create their own mini-lanes. if you have 3 params as AIs, they create 3 different mini lanes.

this is great, but visually there is a lot of wasted space if, for example, you only us an AI for volume at the beginning.

subsequent AIs appear tiny, in their own mini lane. it would be much better if they could be resized, like items in Free Item Positioning mode, to take up the whole media lane.