[BUG] Fix display name truncation issue with ellipsis

Resolved the bug where long display names were truncated incorrectly in the Manage Accounts view.
Now, display names are properly truncated in the middle with ellipsis (...) to maintain readability.

Fixes #4351

Author: Prakhar1701

owncloudApp/src/main/res/layout/account_item.xml

@@ -56,6 +56,7 @@
         android:layout_height="28dp"
         android:layout_marginStart="8dp"
         android:layout_marginTop="8dp"
+        android:ellipsize="middle"
         android:gravity="bottom"
         android:maxLines="1"
         android:text="@string/placeholder_filename"