sna: Don't trim prepare for glyphs_via_mask

If we pass the expected width/height without passing the per-glyph
offset into the preparation function, we make the erroneous mistake of
analysing the glyph cache only for the mask extents and so will miss
glyphs that we need to upload for the operation.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

src/sna/sna_glyphs.c

@@ -978,13 +978,13 @@ next_image:
 						ok = sna->render.composite(sna, PictOpAdd,
 									   this_atlas, NULL, mask,
 									   0, 0, 0, 0, 0, 0,
-									   width, height,
+									   0, 0,
 									   &tmp);
 					} else {
 						ok = sna->render.composite(sna, PictOpAdd,
 									   sna->render.white_picture, this_atlas, mask,
 									   0, 0, 0, 0, 0, 0,
-									   width, height,
+									   0, 0,
 									   &tmp);
 					}
 					if (!ok) {