fix: update type select after fetching default export settings TASK-1…

…296 (#5399)

### 📣 Summary
Type selector for export now reflects the actual last export settings
fetched from history


### 📖 Description
- The export type selection box was not being updated on component mount
when the last exported setting is loaded
- That was causing the silent selection of the export type fetched
without updating the actual selection box
- This way, if the first export of the project was a CSV, then after
fetching this export setting the type selection box would still be
displaying XLS as the default selected, even though the actual selection
in the state was changed to CSV.
- The component is displaying the information from the store, and not
from state
- I added an update to the type in the exportStore when applying the
fetched export settings to the state, so it displays the actual
selection.


### 👀 Preview steps
<!-- Delete this section if behavior can't change. -->
<!-- If behavior changes or merely may change, add a preview of a
minimal happy path. -->

Bug template:
1. ℹ️ have an account and a deployed project with no exports
2. navigate to project > data > downloads
3. select the CSV (or any other than XSL) type to export
4. export the project data
5. leave the Downloads view (by clicking on Gallery, for example)
6. Go back to Downloads view
8. 🔴 [on main] notice that XSL appears as the selected type, even though
it's not. You can check Network tab or just click export to see it
exporting in the actual selected type
9. 🟢 [on PR] notice that the selection box updated to reflect the actual
selected type

jsapp/js/components/projectDownloads/projectExportsCreator.es6

@@ -352,6 +352,8 @@ export default class ProjectExportsCreator extends React.Component {
       }
     });
 
+    exportsStore.setExportType(newStateObj.selectedExportType);
+
     this.setState(newStateObj);
   }