[BUG] - Issues with zooming

[laurentlp]

There are currently two small issues I could find in the zoom feature of the studio.

The first one is that it starts at 200% which I think is a bit too much. Maybe starting with a zoom of 100% would look better.

The second one is that when you zoom out the first time, it does using a step of 26% instead of the default 25%. In my opinion, it would make more sense if I was to zoom out once at 200% that the resulting zoom is at 175%, not 174%.