SvxNumberFormat::SetAbsLSpace takes short

...so there appears to be no good reason to cast from sal_Int32 to sal_uInt16 first

Change-Id: I67384bc736685269acb6c2033b2c4edffd27a510
Reviewed-on: https://gerrit.libreoffice.org/48953
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

editeng/source/uno/unonrule.cxx

@@ -397,7 +397,7 @@ void SvxUnoNumberingRules::setNumberingRuleByIndex(const Sequence<beans::Propert
             sal_Int32 nMargin = 0;
             if( aVal >>= nMargin )
             {
-                aFmt.SetAbsLSpace(static_cast<sal_uInt16>(nMargin));
+                aFmt.SetAbsLSpace(nMargin);
                 continue;
             }
         }