compare_cts_reports: do not show ignored ABI in the sheet

Do not show the ABI name in the compare result spread sheet
if `--ignore-abi` was specified when generating the csv
diff file.

Bug: 315073470
Test: compare_cts_reports.py and generate_spread_sheet.py
Change-Id: I3cd015dd24e6597a4f8453c73638f1302c8e6fb7