simplify icon _img helper #1920

Job	Run time
compile_and_lint	2m 38s
test (postgres, postgres, postgres://root:[email protected]/sqlpage)	2m 17s
test (odbc, postgres, Driver=PostgreSQL Unicode;Server=127.0.0.1;Port=5432;Database=sqlpage;UID=r...	4m 33s
test (mssql, mssql, mssql://root:[email protected]/sqlpage)	1m 55s
windows_test	4m 50s
docker_build (linux/amd64)	5m 17s
docker_build (linux/arm64)	5m 38s
test (mysql, mysql, mysql://root:[email protected]/sqlpage)	1m 42s
docker_build (linux/arm/v7)	5m 14s
docker_push	14s
	34m 18s

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