update G7SensorKit: scan-fix modification

[marionbarker]

Use @motinis proposed scan-fix branch for G7SensorKit

• This improves performance in which G7 sensor readings have not been appearing in the main Trio screen for use in looping
• There can still be issues, but this reduces the number

Because this PR used the current trio branch for the loopandlearn G7SensorKit repository, it also brings in modifications to the pxbproj file that will later be required to modify the build order for the app. That commit has no effect in how the code performs.

[motinis]

Note that Pete brought a different fix - I think it is working better, although you must start scanning explicitly for a new sensor yourself. There is still work-in-progress there, but for your consideration. LoopKit/G7SensorKit#34

[marionbarker]

Additional changes and logging were added to that proposed change. I would let the testing on Loop continue before suggesting changes on Trio.

[dnzxy]

Note that Pete brought a different fix - I think it is working better, although you must start scanning explicitly for a new sensor yourself. There is still work-in-progress there, but for your consideration. LoopKit/G7SensorKit#34

For as long as Pete cannot properly explain what the changed condition is attempting to do or fix, we'll go with this attempted fix solution.