use scalar for file shape; increase shape for small-type columns

Signed-off-by: Jason Volk <jason@zemos.net>

src/database/engine/cf_opts.rs

@@ -33,7 +33,7 @@ fn descriptor_cf_options(
 	opts.set_write_buffer_size(desc.write_size);
 
 	opts.set_target_file_size_base(desc.file_size);
-	opts.set_target_file_size_multiplier(desc.file_shape[0]);
+	opts.set_target_file_size_multiplier(desc.file_shape);
 
 	opts.set_level_zero_file_num_compaction_trigger(desc.level0_width);
 	opts.set_level_compaction_dynamic_level_bytes(false);