Shortcut hints overlay can't be seen over light backgrounds when using no blur

[Doug McMahon]

As described, with no way to increase opacity in 'no blur' the hints screen is unreadable

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.10.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu2
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,regex,resize,gnomecompat,snap,vpswitch,animation,imgpng,dbus,commands,place,grid,move,workarounds,mousepoll,unitymtgrabhandles,expo,session,wall,ezoom,fade,scale,unityshell]
CrashDB: unity
Date: Thu Apr 12 17:31:32 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120409)
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)