[fix](Nereids): move SimplifyAggGroupBy before NormalizeAggregate. (#18918)

fe/fe-core/src/main/java/org/apache/doris/nereids/jobs/batch/NereidsRewriter.java

@@ -150,15 +150,15 @@ public class NereidsRewriter extends BatchRewriteJob {
             ),
 
             topic("Window analysis",
+                topDown(
+                    new SimplifyAggGroupBy()
+                ),
                 topDown(
                     new ExtractAndNormalizeWindowExpression(),
                     // execute NormalizeAggregate() again to resolve nested AggregateFunctions in WindowExpression,
                     // e.g. sum(sum(c1)) over(partition by avg(c1))
                     new NormalizeAggregate(),
                     new CheckAndStandardizeWindowFunctionAndFrame()
-                ),
-                topDown(
-                    new SimplifyAggGroupBy()
                 )
             ),