[osg-submissions] Small fix for osgviewerWX

[Mario Valle]

To make the example compile using a wx build non UNICODE based.
Tested on Linux with wxGTK 2.8.4
Ciao!
		mario

-- 
Ing. Mario Valle
Visualization Group                              | http://www.cscs.ch/~mvalle
Swiss National Supercomputing Centre (CSCS)      | Tel:  +41 (91) 610.82.60
v. Cantonale Galleria 2, 6928 Manno, Switzerland | Fax:  +41 (91) 610.82.82
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