[fix](function) fix error return type in corr(float32,float32) (#39251) (#39350)

https://github.com/apache/doris/pull/39251
```
mysql [test11]>select corr(cast(x as float),cast(y as float)) from test_corr;
ERROR 1105 (HY000): errCode = 2, detailMessage = (127.0.0.1)[INTERNAL_ERROR]column_type not match data_types in agg node, column_type=Nullable(Float64), data_types=Nullable(Float32),column name=

```

## Proposed changes

Issue Number: close #xxx

<!--Describe your changes.-->

be/src/vec/aggregate_functions/aggregate_function_binary.h

@@ -41,8 +41,7 @@ template <typename T1, typename T2, template <typename> typename Moments>
 struct StatFunc {
     using Type1 = T1;
     using Type2 = T2;
-    using ResultType = std::conditional_t<std::is_same_v<T1, T2> && std::is_same_v<T1, Float32>,
-                                          Float32, Float64>;
+    using ResultType = Float64;
     using Data = Moments<ResultType>;
 };