tdf#154622: remove erroneous validity dropdown expand shortcut in extended tip

We can't easily make keyboard shortcuts adapt to OS in extended tips, and
it is already in the documentation with helpcontent2 commit 278e5201987892072da38033bba89b96af87e2af.

Change-Id: I018af2043701ab46b479fffaa29ffa00f9f6b45f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/149993
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
Tested-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
diff --git a/sc/uiconfig/scalc/ui/validationcriteriapage.ui b/sc/uiconfig/scalc/ui/validationcriteriapage.ui
index 48f2395..e18aaa9 100644
--- a/sc/uiconfig/scalc/ui/validationcriteriapage.ui
+++ b/sc/uiconfig/scalc/ui/validationcriteriapage.ui
@@ -229,7 +229,7 @@
        <property name="draw-indicator">True</property>
        <child internal-child="accessible">
          <object class="AtkObject" id="showlist-atkobject">
            <property name="AtkObject::accessible-description" translatable="yes" context="validationcriteriapage|extended_tip|showlist">Shows a list of all valid strings or values to select from. The list can also be opened by selecting the cell and pressing Ctrl+D.</property>
            <property name="AtkObject::accessible-description" translatable="yes" context="validationcriteriapage|extended_tip|showlist">Shows a list of all valid strings or values to select from.</property>
          </object>
        </child>
      </object>