FileDialog: enlarge the file list a bit

[ghost]

After:

Edit: changed the ratio from 4:1 to 4:3

Before:
screenshot from 2017-10-06 21-08-19screenshot from 2017-10-06 21-03-26

[djrm]

@Noshyaar maybe it would be better if the filter button shows all its contents, instead of clipping them.

[akien-mga]

I like the change, but yeah something should be done for the filter drop-down list.

[akien-mga]

Bump - any idea how to improve this clipping of the file type selector?

[djrm]

the easiest way in my opinion (might not work on all possible cases) is to reduce the size of the file name input, file names are not that long, also the text could be clipped some units before the arrow, i dont think godot has a feature to mark clipped text (like ..., or some fade)

[ghost]

Changed the ratio from 4:1 to 4:3

[akien-mga]

Looks good.