delete milestone conjoined bug

Fixed in stable r11341 <http://bazaar.launchpad.net/~launchpad-pqm/launchpad/stable/revision/11341>.

This fix is bad. We need to land a correct fix very quickly to prevent the last attempted fix from introducing bad data. The slave was deleted in my QA on edge, but we wanted to delete the master. ie. https://bugs.edge.launchpad.net/gdp/trunk/+bug/420173 shows a master bug without a slave. The master is targeted to a series, which make no sense since there is no bug in the project. This may require SQL to fix.

This bad chunk:
            if bugtask.conjoined_master is not None:
                Store.of(bugtask).remove(bugtask)
 should be:
            if bugtask.conjoined_master is not None:
                Store.of(bugtask.conjoined_master).remove(bugtask)

I was still being idiotic. The correct fix, as pointed out by edwin-grubbs is:
            if bugtask.conjoined_master is not None:
                Store.of(bugtask).remove(bugtask.conjoined_master)

And the data was fixed by Edwin by using affects projects link to add a gdp bugtask back to the bug. The lesson learned is that conjoined bugs are very loosely coupled. The relationship is inferred from state.

Fixed in stable r11356 <http://bazaar.launchpad.net/~launchpad-pqm/launchpad/stable/revision/11356>.