default to 'flat' instead of '3D Look' for form controls

better matches what the pdf/print output will be.

Change-Id: I86869024768877f8345c4a0c320eb24d48b35f13
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/140947
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/forms/source/richtext/richtextmodel.cxx b/forms/source/richtext/richtextmodel.cxx
index 57207e4..c07dcb4 100644
--- a/forms/source/richtext/richtextmodel.cxx
+++ b/forms/source/richtext/richtextmodel.cxx
@@ -506,7 +506,7 @@ namespace frm
            break;

        case PROPERTY_ID_BORDER:
            aDefault <<= sal_Int16(1);
            aDefault <<= sal_Int16(2);
            break;

        default: