[travis] Add protection against unscaled sizes

As pointed out by @poire-z

* [fix, UX] SkimToWidget scaling

* [fix] Button scaling

* [fix, UX] Scale ProgressWidget

* [fix, UX] Scale confirmbox

* [fix, UX] Scale just about everything

frontend/ui/widget/multiinputdialog.lua

@@ -84,8 +84,8 @@ function MultiInputDialog:init()
     })
 
     self.dialog_frame = FrameContainer:new{
-        radius = 8,
-        bordersize = 3,
+        radius = Screen:scaleBySize(8),
+        bordersize = Screen:scaleBySize(3),
         padding = 0,
         margin = 0,
         background = Blitbuffer.COLOR_WHITE,