patch 8.2.3165: Vim9: in a || expression the error line number may be wrong

Problem:    Vim9: in a || expression the error line number may be wrong.
Solution:   Save and restore the line number when checking the type.
            (closes #8569)

src/testdir/test_vim9_expr.vim

@@ -401,6 +401,13 @@ def Test_expr2_fails()
     # comment
   END
   CheckScriptFailure(lines, 'E1004: White space required before and after ''||'' at "||true"', 3)
+
+  lines =<< trim END
+      var x = false
+              || false
+              || a.b
+  END
+  CheckDefFailure(lines, 'E1001:', 3)
 enddef
 
 " test &&