Fix(macros): @FILTER with a single non-array argument #3983

Job	Run time
changes	5s
test-dbt-versions (1.4)	1m 45s
test-dbt-versions (1.5)	1m 47s
test-dbt-versions (1.3)	2m 1s
test-dbt-versions (1.9)	1m 48s
test-dbt-versions (1.6)	1m 45s
test-dbt-versions (1.7)	1m 48s
test-dbt-versions (1.10)	2m 8s
test-dbt-versions (1.8)	1m 45s
test-vscode	0s
test-vscode-e2e	0s
cicd-tests-windows	12m 14s
migration-test	1m 39s
doc-tests	40s
style-and-cicd-tests (3.13)	23m 7s
style-and-cicd-tests (3.10)	25m 0s
style-and-cicd-tests (3.11)	24m 27s
style-and-cicd-tests (3.9)	22m 45s
engine-tests-docker (postgres)	2m 43s
style-and-cicd-tests (3.12)	23m 53s
engine-tests-docker (spark)	5m 38s
engine-tests-docker (mysql)	1m 47s
engine-tests-docker (risingwave)	2m 47s
engine-tests-docker (clickhouse)	2m 48s
engine-tests-docker (trino)	8m 49s
engine-tests-docker (duckdb)	2m 3s
engine-tests-docker (mssql)	2m 13s
engine-tests-docker (starrocks)	3m 2s
ui-test	0s
ui-style	0s
engine-tests-cloud	0s
	3h 0m 27s

Provide feedback