[SB][Sat] Always show satellite carrier text in shade if available.

This isn't my favorite way to fix this, but it's what we can do given
the state of the current code and what little time we have left.

Fixes: 341841138
Flag: com.android.internal.telephony.flags.oem_enabled_satellite_flag
Test: In SysUI demo mode, enter satellite mode then open the shade
-> verify the header has the satellite carrier text
Test: atest CarrierTextManagerTest ShareCarrierGroupControllerTest

Change-Id: I1bd7a67d7a2f0f9971ad5fab638adf2d78eac6be