[manuf] Fix missing test tags for FT FPGA tests

Commit fd9ba9d dropped some test coverage,
since the conditional unintentionally removes the default test tags if it
evaluates to False.

This commit fixes the issue and should fix the "Verify FPGA jobs" CI workflow.

Signed-off-by: Noah Moroze <noah@opentitan.org>

sw/device/silicon_creator/manuf/base/BUILD

@@ -417,7 +417,7 @@ filegroup(
             tags = [
                 "lc_test_locked0",
                 "manuf",
-            ] + ["manual"] if config.get("offline", False) else [],
+            ] + (["manual"] if config.get("offline", False) else []),
             test_cmd = _FT_PROVISIONING_CMD_ARGS,
             test_harness = _FT_PROVISIONING_HARNESS.format(sku),
         ),