Add support for exporting to tsv, in addtion to csv

Helpful when symbols can contain commas.
diff --git a/src/bloaty.h b/src/bloaty.h
index 856b61d..accc0ae 100644
--- a/src/bloaty.h
+++ b/src/bloaty.h
@@ -472,9 +472,6 @@
         case bloaty::OutputFormat::kTSV:
           PrintToCSV(out, /*tabs=*/true);
           break;
-        case bloaty::OutputFormat::kTSV:
-          PrintToCSV(out, /*tabs=*/true);
-          break;
         default:
           BLOATY_UNREACHABLE();
       }