after
    commit b90e098a
    use BitmapEx in LwpBackgroundStuff

<caolan> maybe the lotuswordpro original stride is really 4 after all
(as a common stride), with the first byte on each line containing the
8bits for each row

The original code in GetPattern() looked pretty dodgy since it was
copying 32-bytes into an 8 byte buffer.
Assume that the reversing part is right, and that the format is really a
1bit packed 8x8 image.

Also fix the decoding of such a image in CreateFromData to assume packed
format, which is more predictable.

Also fix the bug in createDefaultCross_3x3 which changing the assert
revealed.

Change-Id: I7196ae601429bbe0f842399df61c8b858e022d3e
Reviewed-on: https://gerrit.libreoffice.org/49808Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>