geom/m46148: swap bits 5 and 6 of occupancy coding order

This commit updates the geometry octree node occupancy map scan order
to permit better screening of b6 from the right.

tmc3/tables.cpp

@@ -257,7 +257,7 @@ const uint8_t pcc::kOccMapRotateZ090[256] = {
 
 //============================================================================
 
-const int8_t pcc::kOccBitCodingOrder[8] = {1, 7, 5, 3, 2, 4, 6, 0};
+const int8_t pcc::kOccBitCodingOrder[8] = {1, 7, 5, 3, 2, 6, 4, 0};
 
 //============================================================================