Increase default size of editor window

[plante-msft]

This is a nitpick and is only labeled as P0 because it shouldn't take much time but makes the experience much smoother, since I find myself consistently needing to resize the editor.

We should increase the default size of the editor window so that scrolling through the apps list is less necessary / more fluid. Currently if user doesn't resize, each mousewheel "scroll" will move past an app or two in a long list. Increasing the editor size to show more apps by default will make this more fluid.

Current size:

Proposed bigger size:

It's unlikely users will be multitasking while using the editor, so might as well use all the space we can get! We could make it even bigger than this honestly.