QmlDesigner: Fix layout of 3D import list

Made list a bit wider so that there will be no horizontal scroll on the
list. Also shortened the size info label text a bit so it won't cut off
as easily on systems with larger default font.

Fixes: QDS-13015
Change-Id: I39c175be42e743b0700079ddd5543a9c54bb975b
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

src/plugins/qmldesigner/components/itemlibrary/itemlibraryassetimportdialog.cpp

@@ -1262,7 +1262,7 @@ void ItemLibraryAssetImportDialog::onImportReadyForPreview(
             QString s;
             s += truncName + '\n';
             s += tr("Object Type: %1\n").arg(data.type);
-            s += tr("Imported Size: %1").arg(QLocale::system().formattedDataSize(
+            s += tr("Import Size: %1").arg(QLocale::system().formattedDataSize(
                 data.size, 2, QLocale::DataSizeTraditionalFormat));
             l->setText(s);
         }

src/plugins/qmldesigner/components/itemlibrary/itemlibraryassetimportdialog.ui

@@ -33,7 +33,7 @@
        </property>
        <property name="minimumSize">
         <size>
-         <width>250</width>
+         <width>260</width>
          <height>0</height>
         </size>
        </property>