You will need a somewhat different circuit configuration to achieve a hold on latch. A couple of transistors interconnected like shown here would do the trick.
Note that with this configuration the maximum safe load current cannot exceed the maximum steady state current that the PNP transistor can sustain. For small signal transistors such as the 2N3904 and 2N3906 this limit will be on the order of about 5mA. So if you want to use this to switch a higher current load you would want to connect another switching circuit to the output of this latch.