Fix #11971 - Fix display of MS SQL layers with z and m values

Funded by TechnoglogyOne, Australia

- Backported to 2.8.3
- Cherry-picked from 012f322

Author: NathanW2

src/providers/mssql/qgsmssqlgeometryparser.cpp

@@ -493,9 +493,9 @@ unsigned char* QgsMssqlGeometryParser::ParseSqlGeometry( unsigned char* pszInput
 
   chProps = ReadByte( 5 );
 
-  if ( chProps & SP_HASMVALUES )
+  if ( chProps & SP_HASZVALUES && chProps & SP_HASMVALUES )
     nPointSize = 32;
-  else if ( chProps & SP_HASZVALUES )
+  else if ( chProps & SP_HASZVALUES || chProps & SP_HASMVALUES)
     nPointSize = 24;
   else
     nPointSize = 16;