fix: only show Edit tab if editMetadataEnabled is true (#2136)

## Description
If editDatasetEnabled is true but editMetadataEnabled is false the Edit
tab still shows.
This PR fixes that.

## Changes:
- remove [hidden] attribute
- put both conditions in ngIf

## Tests included
- [ ] Included for each change/fix?
- [ ] Passing? (Merge will not be approved unless this is checked) 

## Documentation
- [ ] swagger documentation updated \[required\]
- [ ] official documentation updated \[nice-to-have\]

### official documentation info
If you have updated the official documentation, please provide PR # and
URL of the pages where the updates are included

## Backend version
- [ ] Does it require a specific version of the backend
- which version of the backend is required:

## Summary by Sourcery

Bug Fixes:
- Prevent the Edit tab from being shown when metadata editing is
disabled in the application configuration.

Author: nitrosx

src/app/datasets/dataset-detail/dataset-detail/dataset-detail.component.html

@@ -398,8 +398,7 @@
                 </mat-tab>
                 <mat-tab
                   class="editTab"
-                  *ngIf="editingAllowed"
-                  [hidden]="!appConfig.editMetadataEnabled"
+                  *ngIf="editingAllowed && appConfig.editMetadataEnabled"
                 >
                   <ng-template mat-tab-label>
                     <mat-icon> edit </mat-icon> Edit