Fix drawarrays-vertex-count GL_LINES test
Use the same + 0.5 trick as GL_LINE_LOOP / GL_LINE_STRIP. This fixes the test on both radeonsi and Nvidia 410.104 when using -fbo.
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Use the same + 0.5 trick as GL_LINE_LOOP / GL_LINE_STRIP. This fixes the test on both radeonsi and Nvidia 410.104 when using -fbo.