btrfs: relocation: switch bitfields to bool in reloc_control

Use bool types for the indicators instead of bitfields. The structure
size slightly grows but the new types are placed within the padding.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>