NFC SwUnoCursorHelper: add SetModeAttr option to setPropertyValue

The other function, setPropertyValues already has this variable,
so for consistency and flexibility, add it here as well. Plus, this
is prep work for another patch.

Change-Id: I16c5b1cbb9fd99a11be99a59005bd856d787a6ca
Reviewed-on: https://gerrit.libreoffice.org/54510Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Justin Luth <justin_luth@sil.org>

sw/inc/unocrsrhelper.hxx

@@ -156,7 +156,8 @@ namespace SwUnoCursorHelper
             SwPaM& rPaM,
             const SfxItemPropertySet & rPropSet,
             const OUString & rPropertyName,
-            const css::uno::Any & rValue);
+            const css::uno::Any & rValue,
+            const SetAttrMode nAttrMode = SetAttrMode::DEFAULT);
     /// @throws css::beans::UnknownPropertyException
     /// @throws css::beans::PropertyVetoException
     /// @throws css::lang::IllegalArgumentException

sw/source/core/unocore/unoobj.cxx

@@ -1752,12 +1752,13 @@ uno::Any SwUnoCursorHelper::GetPropertyValue(
 void SwUnoCursorHelper::SetPropertyValue(
     SwPaM& rPaM, const SfxItemPropertySet& rPropSet,
     const OUString& rPropertyName,
-    const uno::Any& rValue)
+    const uno::Any& rValue,
+    const SetAttrMode nAttrMode)
 {
     uno::Sequence< beans::PropertyValue > aValues(1);
     aValues[0].Name = rPropertyName;
     aValues[0].Value = rValue;
-    SetPropertyValues(rPaM, rPropSet, aValues, SetAttrMode::DEFAULT);
+    SetPropertyValues(rPaM, rPropSet, aValues, nAttrMode);
 }
 
 // FN_UNO_PARA_STYLE is known to set attributes for nodes, inside