Revert "fix: reorder output and plans in explain.slt"

This reverts commit 41e84d3.

Author: kosiew

datafusion/sqllogictest/test_files/explain.slt

@@ -647,11 +647,11 @@ logical_plan
 02)--{
 03)----"Plan": {
 04)------"Node Type": "Values",
-05)------"Output": [
-06)--------"column1"
-07)------],
-08)------"Plans": [],
-09)------"Values": "(Int64(1))"
+05)------"Values": "(Int64(1))",
+06)------"Plans": [],
+07)------"Output": [
+08)--------"column1"
+09)------]
 10)----}
 11)--}
 12)]