DataTable - Headers of Columns with exportable at false are exported

[befabry]

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[ x] bug report
[ ] feature request
[ ] support request => Please do not submit support request here, instead see https://forum.primefaces.org/viewforum.php?f=57

Codesandbox Case (Bug Reports)
https://codesandbox.io/s/sad-bell-mmwky?file=/src/demo/DataTableExportDemo.js

Current behavior
The header of the Column with exportable at false is exported

Expected behavior
When I have a Column with exportable at false, I do not expect its header value to be exported

Minimal reproduction of the problem with instructions

Create a DataTable with a Column with exportable at false, export the CSV

https://codesandbox.io/s/sad-bell-mmwky?file=/src/demo/DataTableExportDemo.js

Please tell us about your environment:

Windows 10, VS Code, NPM

• React version:
  17.0.1

• PrimeReact version:
  6.2.1

• Browser:
  Chrome 91 | Firefox 89

• Language: [all | TypeScript X.X | ES6/7 | ES5]
  TS in local, JS on codesandbox