Adapt to using Kirigami.ScrollablePage a bit better

We need to manually turn off its page header and padding, otherwise we
get these in a circumstance where they're unnecessary.

samba/filepropertiesplugin/qml/UserPage.qml

@@ -12,6 +12,14 @@ import org.kde.filesharing.samba 1.0 as Samba
 Kirigami.ScrollablePage {
     background: Item {} /* this page is inside a tabbox, we want its background, not a window/page background */
 
+    globalToolBarStyle: Kirigami.ApplicationHeaderStyle.None
+
+    // the page it lives within already has its own
+    leftPadding: 0
+    rightPadding: 0
+    topPadding: 0
+    bottomPadding: 0
+
     Keys.onPressed: {
         // We need to explicitly handle some keys inside the sheet. Since the sheet is no FocusScope we will catch
         // them here and feed them to the sheet instead.