Update mmcPresent in the Seeker main loop.
Update mmcPresent in the Seeker main loop.

This fixes a problem that could occur when using
MMC.redetectCaptureDevices that was updated a few months ago where
the Seeker wouldn't record if there were no devices at startup, and then
devices were dynamically added (but then would work on the next restart
because at that point the devices were in the config).

JustFred51/sagetv,google/sagetv,gasinger/sagetv,stuckless/sagetv,troll5501/sagetv,webernissle/sagetv,troll5501/sagetv,jfthibert/sagetv,andyvshr/sagetv,JREkiwi/sagetv,BartokW/sagetv,tmiranda1962/sagetv-1,skiingwiz/sagetv,enternoescape/sagetv,BartokW/sagetv,OpenSageTV/sagetv,skiingwiz/sagetv,jusjoken/sagetv,jlverhagen/sagetv,google/sagetv,JustFred51/sagetv,stuckless/sagetv,enternoescape/sagetv,webernissle/sagetv,jason-bean/sagetv,enternoescape/sagetv,andyvshr/sagetv,gasinger/sagetv,stuckless/sagetv,enternoescape/sagetv,jusjoken/sagetv,jfthibert/sagetv,google/sagetv,rflitcroft/sagetv,jason-bean/sagetv,andyvshr/sagetv,BartokW/sagetv,jfthibert/sagetv,andyvshr/sagetv,OpenSageTV/sagetv,jfthibert/sagetv,troll5501/sagetv,troll5501/sagetv,tmiranda1962/sagetv-1,rflitcroft/sagetv,JREkiwi/sagetv,jusjoken/sagetv,gasinger/sagetv,skiingwiz/sagetv,jlverhagen/sagetv,skiingwiz/sagetv,OpenSageTV/sagetv,rflitcroft/sagetv,webernissle/sagetv,JustFred51/sagetv,BartokW/sagetv,JREkiwi/sagetv,jason-bean/sagetv,JustFred51/sagetv,jusjoken/sagetv,JREkiwi/sagetv,rflitcroft/sagetv,google/sagetv,jlverhagen/sagetv,tmiranda1962/sagetv-1,jason-bean/sagetv,OpenSageTV/sagetv,tmiranda1962/sagetv-1,stuckless/sagetv,gasinger/sagetv,webernissle/sagetv,jlverhagen/sagetv