Fix hard-coded corner radii

[juancampa]

Problem

Two widgets had hard-coded corner radius instead of using the WidgetVisuals value.

Solution

Remove the hard-coded values and use the style instead.

Context

I tried to make a style with non rounded corners and noticed that certain widgets kept their roundness.

It turned out that there were two widgets with hard-coded values. This PR uses the value from the WidgetVisual which seems like the right thing to do. Maybe there's a reason not to but it seems to fix my problem with no apparent downsides.

Check.sh Issues

Note that I tried running check.sh but it fails to compile 'speech-dispatcher'. Most likely because the version on libspeechd I installed on my machine (latest on Arch linux) is too new and doesn't work with the existing crate.

[emilk]

Look good, but needs cargo fmt.

Please file an issue about check.sh and what line in it fails, and with what message!

[juancampa]

Look good, but needs cargo fmt.

Please file an issue about check.sh and what line in it fails, and with what message!

Done and done