tdf#100342 fix order of weekdays in NETWORKDAYS

For the definition of working/weekend days, ODFF1.2 uses 0..6
for Sunday..Saturday. NETWORKDAYS used ISO ordering (Monday..Sunday),
but now complies with ODFF1.2.

Change-Id: I169433adfac5d66af979181c328658040d7ab77f
Reviewed-on: https://gerrit.libreoffice.org/26246Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>

sc/source/core/tool/interpr2.cxx

@@ -330,8 +330,9 @@ sal_uInt16 ScInterpreter::GetWeekendAndHolidayMasks(
             if ( nWeekendDays.size() != 7 )
                 return  errIllegalArgument;
 
+            // Weekend days defined by string, Sunday...Saturday
             for ( int i = 0; i < 7; i++ )
-                bWeekendMask[ i ] = ( bool ) nWeekendDays[ i ];
+                bWeekendMask[ i ] = ( bool ) nWeekendDays[ ( i == 6 ? 0 : i + 1 ) ];
         }
     }
     else