Attempt to fix occasional issue of uninitialized MapBlock data

src/map.cpp

@@ -2311,7 +2311,7 @@ bool ServerMap::initBlockMake(BlockMakeData *data, v3s16 blockpos)
 	// Add the area
 	{
 		//TimeTaker timer("initBlockMake() initialEmerge");
-		data->vmanip->initialEmerge(bigarea_blocks_min, bigarea_blocks_max, false);
+		data->vmanip->initialEmerge(bigarea_blocks_min, bigarea_blocks_max);
 	}
 
 	// Ensure none of the blocks to be generated were marked as containing CONTENT_IGNORE