test: fix spurious quote in sql string
This was passing in sqlglot==5.1.0,
but not in sqlglot>=6.0.0
(as it should not, this is wrong)
@@ -11,7 +11,7 @@ def test_2_to_3(tmp_path):
case
when col_1_l is null or col_1_r is null then -1
when col_1_l = col_1_r then 1
- else 0 end as gamma_col_1'
+ else 0 end as gamma_col_1
"""
sql_col2 = """
