Getting updated reef-pi code from JFReyes

[JFReyes]

User @sakiscr reported an issue with pH calibration in version 4.1-131-gf905e4d-MODIFIED which results in the calibration dialog not displaying when the button is clicked. I have confirmed the problem and believe it's related to the similar issue with dosing calibration I reported earlier. Seems that the bug introduced after the last upstream 4.1 release was more widespread than I thought and I missed that. I'm working on a fix and will release a new version soon. In the meantime I suggest that users with this need load the official v.4.1 version from Ranjib's Github here to perform calibration and then reload my modified version afterwards, as that shouldn't affect previous calibrations. Thank you for your patience.

Regards,