Windows build crash at startup

[raoulh]

Version: 0.8.3.3850
Environment: Windows 8.1
Redis Server Version: not relevant

Steps to reproduce:

1. Install from http://redisdesktop.com/download
2. Start

Expected result:
Application starts

Actual Result:
Crash with:

A fix is be to install a valid qt.conf file containing:

[Paths]
Prefix=..

It works perfectly then.

[uglide]

Related to #3586

[uglide]

Fixed in 0.8.6