GLTF Viewer: updated file dialog
GLTF Viewer: updated file dialog

DiligentGraphics/DiligentSamples,DiligentGraphics/DiligentSamples,DiligentGraphics/DiligentSamples,DiligentGraphics/DiligentSamples,DiligentGraphics/DiligentSamples,DiligentGraphics/DiligentSamples