fate/lavfi: increase vf tile coverage.

tests/lavfi-regression.sh

@@ -60,7 +60,7 @@ do_lavfi "select"             "select=not(eq(mod(n\,2)\,0)+eq(mod(n\,3)\,0))"
 do_lavfi "setdar"             "setdar=16/9"
 do_lavfi "setsar"             "setsar=16/11"
 do_lavfi "thumbnail"          "thumbnail=10"
-do_lavfi "tile"               "tile=3x3"
+do_lavfi "tile"               "tile=3x3:nb_frames=5:padding=7:margin=2"
 do_lavfi "transpose"          "transpose"
 do_lavfi "unsharp"            "unsharp=10:10:-1.5:10:10:-1.5"
 do_lavfi "vflip"              "vflip"

tests/ref/lavfi/tile

-tile                e36d067fb3e6e7b96522b7b0124f3850
+tile                bfd98570151154d078b14398f867f0e8