Fix error banner not getting removed on correct upload (#3114)

This line:

https://github.com/Stirling-Tools/Stirling-PDF/blob/9a0dad8bd7f2ae4333dab78d6313c5d95c4ac9b8/src/main/resources/static/js/DecryptFiles.js#L50

Appears to not relinquish flow control correctly and leads to
`this.removeErrorBanner()` not getting called. Since the program still
functions correctly I simply ensured that `removeErrorBanner()` is
called before the `await` call to ensure that it works. Uploading a
functioning pdf will now successfully remove the error banner.

As to why the await call isn't functioning correctly I'm not sure, but
the download appears to be working as it only seems to skip the error
banner part.

Closes #2419

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [x] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings

### Documentation

- [x] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [x] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [x] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [x] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

src/main/resources/static/js/DecryptFiles.js

@@ -47,9 +47,11 @@ export class DecryptFile {
       });
 
       if (response.ok) {
-        const decryptedBlob = await response.blob();
         this.removeErrorBanner();
-        return new File([decryptedBlob], file.name, {type: 'application/pdf'});
+        const decryptedBlob = await response.blob();
+        return new File([decryptedBlob], file.name, {
+          type: "application/pdf",
+        });
       } else {
         const errorText = await response.text();
         console.error(`${window.decrypt.invalidPassword} ${errorText}`);