Make splash screen wider, opaque and fix it's spinner radius

Radius should be such that final spin doesn't extend out of the circle
Opaque background improves contrast for better visual

src/interface/desktop/loading-animation.js

@@ -1,11 +1,11 @@
 var $wrap = document.getElementById('loading-animation'),
 
-canvassize = 280,
+canvassize = 380,
 
 length = 40,
-radius = 7.3,
+radius = 6.8,
 
-rotatevalue = 0.035,
+rotatevalue = 0.02,
 acceleration = 0,
 animatestep = 0,
 toend = false,