Force "continuous temperature read" mode in the simulator

[phord]

Simulator's --report-temptable functionality is broken by the new reduced-workload ADC conversions. If we turn on continuous read mode we will get a result every time. This makes sense for this simulator function, though we may want to address it with more finesse in the future, for example, making the simulator aware of the need and thereby testing the periodic ADC kickstart functions in simulator mode.

But maybe that's crazy.

TBD: Need to add a test to regressiontests to catch this falling over again.