* Fix indentation

compiler/pexpr.pas

@@ -141,9 +141,9 @@ implementation
            end
           else
             begin
-             // string[x] is allowed in system unit since it is a shortstring.
-             if cs_compilesystem in current_settings.moduleswitches then
-               Message(parser_e_nostringaliasinsystem);
+              // string[x] is allowed in system unit since it is a shortstring.
+              if cs_compilesystem in current_settings.moduleswitches then
+                Message(parser_e_nostringaliasinsystem);
               if cs_refcountedstrings in current_settings.localswitches then
                 begin
                   if m_default_unicodestring in current_settings.modeswitches then