_get_f_placeholder_args: set ForceValueArgTag #1733

Job	Run time
Documentation	2m 2s
Mypy	1m 47s
Examples Conda Py3	1m 32s
Tests for downstream project meshmode	9m 29s
Tests for downstream project grudge	10m 10s
Pylint	1m 45s
Pytest Conda Py3 Intel	2m 8s
Pytest Conda Py3 POCL	2m 35s
Tests for downstream project mirgecom	5s
Tests for downstream project mirgecom_examples	3s
Ruff	8s
Typos	4s
	31m 48s

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