Update the GBT RX phases during configuration creation
Description
When producing a new GBT configuration in the current version of the code, it always includes all values from the input file. In practice, it means all phases in the system are always updated, regardless of the "scan quality".
Similarly to the VFAT, the GBT configuration creation routine should only update the phase when a better one is available (i.e. regular > default > invalid). That should help in figuring out the complete set of best phases on large-scale systems such as P5.