wic:plugins:otaimage.py: fix a potential issue

do_image_wic task is a standalone task that depending on
do_image_ota_ext4, so it's possible that do_image_wic runs
(taskhash contaminated) but do_image_ota_ext4 does not (taskhash not
contaminated), in which case, the otaimage would be in DEPLOY_DIR_IMAGE
instead of in IMGDEPLOYDIR, so we need check both of them.

Also, the logger.error is not supposed to raise a error, it just
prints out a error message, so we should use WicError.

And another typo is it checks IMGDEPLOYDIR but reports DEPLOY_DIR_IMAGE
not exist, also fix that.

Signed-off-by: Ming Liu <liu.ming50@gmail.com>

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