Assign an existing location to a sensor

[richardmoizeau]

Describe the bug

Currently, when you pair a sensor with mSupply Mobile, it automatically creates a new location and the sensor is "assigned" to it.

Proposed Solution

We should be able to assign a sensor to an existing location (if we implement mSupply Mobile Cold Chain at an exising customer, with existing cold storage location).

Version and device info

• App version: 8.XX