Testgl.c minor bug fix for fullscreen mode

While trying to sleuth out an OpenGL fullscreen bug in one of my own programs,
I began pouring through some of the SDL sample code and encountered the
following bug:

In the file testgl.c, change line 445

from:

if ( strcmp(argv[1], “-fullscreen”) == 0 ) {

to:

if ( strcmp(argv[i], “-fullscreen”) == 0 ) {

Minor bug, but might help someone else out who is trying to pass
the command-line params -logo -fullscreen like I was! :)---------------------------------
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