Rename flag as enable_ni_supl_message_injection_by_carrier_config_bugfix

Trunk Stable flag can only be updated by creating a new flag.
ag/29386156 tries to update the metadata of an existing flag, which does
not work.

Flag: android.location.flags.enable_ni_supl_message_injection_by_carrier_config_bugfix
Bug: 242105192
Test: flag rename only
Change-Id: I67ab9b239f2af941ba746a8f3f63ce86cc13d4c4