UI: move icons from default into colorful theme.

colorful theme has been default theme for awhile. having colorful theme
try and grab icons from other theme doesn't work on Linux.

Also adding two additional icons, info is to hint to the user that they
should hit verify after pasting in a token, sync is to show that the
verification is occurring.

dist/qt_themes/qdarkstyle/icons/index.theme

@@ -1,7 +1,7 @@
 [Icon Theme]
 Name=qdarkstyle
 Comment=dark theme
-Inherits=default
+Inherits=colorful
 Directories=16x16,48x48,256x256
  
 [16x16]
@@ -11,4 +11,4 @@ Size=16
 Size=48
 
 [256x256]
-Size=256
+Size=256