Don't limit carrier text when using large screen

When using the large screen header that fits in one line, we don't need
to limit the length of the carrier text (and it looks bad if we do).

Test: manual
Test: atest QSCarrierTest
Fixes: 245747995

Change-Id: Iec2e30f6fd5aa5e4e5e7a9d22c31f52a183f9f00