clients/simple-egl: Allow translucent 16-bit surfaces

This allows users to get r5g5b5a1 configs which currently (in Mesa) interact
badly with EGL_EXT_present_opaque, and act as a good test case for the EGL
implementation.

Users can still get a 16-bit surface without alpha by using the "-o" flag.

Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>

clients/simple-egl.c

@@ -198,7 +198,7 @@ init_egl(struct display *display, struct window *window)
 	EGLBoolean ret;
 	int r, g, b, a;
 
-	if (window->opaque || window->buffer_bpp == 16)
+	if (window->opaque)
 		config_attribs[9] = 0;
 
 	display->egl.dpy =