chore(oracle): update snapshots

ibis/backends/tests/snapshots/test_sql/test_group_by_has_index/oracle/out.sql

@@ -1,5 +1,5 @@
 SELECT
-  CASE t0."continent"
+  CASE "t0"."continent"
     WHEN 'NA'
     THEN 'North America'
     WHEN 'SA'
@@ -16,10 +16,10 @@ SELECT
     THEN 'Antarctica'
     ELSE 'Unknown continent'
   END AS "cont",
-  SUM(t0."population") AS "total_pop"
-FROM "countries" t0
+  SUM("t0"."population") AS "total_pop"
+FROM "countries" "t0"
 GROUP BY
-  CASE t0."continent"
+  CASE "t0"."continent"
     WHEN 'NA'
     THEN 'North America'
     WHEN 'SA'

ibis/backends/tests/snapshots/test_sql/test_isin_bug/oracle/out.sql

@@ -1,13 +1,9 @@
 SELECT
-  t0."x" IN (
+  "t0"."x" IN (
     SELECT
-      t1."x"
-    FROM (
-      SELECT
-        t0."x" AS "x"
-      FROM "t" t0
-      WHERE
-        t0."x" > 2
-    ) t1
-  ) AS "InColumn(x, x)"
-FROM "t" t0
+      "t0"."x"
+    FROM "t" "t0"
+    WHERE
+      "t0"."x" > 2
+  ) AS "InSubquery(x)"
+FROM "t" "t0"