Disable lpf across tile in AV1ExtTileTest

This fixes the test failure since af7846ec.

Change-Id: I0905a473841e546b13c30702219efbb0b8b092c6

test/av1_ext_tile_test.cc

@@ -88,6 +88,9 @@ class AV1ExtTileTest
 #if CONFIG_EXT_PARTITION
       // Always use 64x64 max partition.
       encoder->Control(AV1E_SET_SUPERBLOCK_SIZE, AOM_SUPERBLOCK_SIZE_64X64);
+#endif
+#if CONFIG_LOOPFILTERING_ACROSS_TILES
+      encoder->Control(AV1E_SET_TILE_LOOPFILTER, 0);
 #endif
     }