offliner definition version is not tracked in schedule history

[benoit74]

I've just updated both image version and offliner definition, and the history shows only the image version has changed, see https://farm.openzim.org/recipes/gutenberg_mul_all/history?compare=82db4635-f26d-4f37-a895-d74cdb00a3bd...0ec47a47-817c-404e-ac09-3bd7adc6316a

[elfkuzco]

the schedule history table doesn't contain the offliner definition id/version. will add the column so it reflects