Fix confirmation message for multiple downloads

[buzzia2001]

Changes

With this PR, the modal for confirming file overwrites in multiple downloads has now been fixed. Before this fix, the entire message was displayed in the confirmation button

How to test this PR

1. Connect to an IBM i, open the IFS Browser.
2. Go to an IFS folder containing at least 2 files (streamfiles).
3. Select two or more files using Ctrl/Shift+click.
4. Right-click → Download, then choose a local destination folder.
5. Let the download complete (those files now exist locally in the folder you chose).
6. Repeat steps 3–4 by selecting the same files again and choosing the same destination folder. Now you'll have a modal with YES

Checklist

• have tested my change
• have created one or more test cases
• updated relevant documentation
• Remove any/all console.logs I added
• have added myself to the contributors' list in CONTRIBUTING.md

[sebjulliand]

Looks good!