patch 8.2.1331: Vim9: :echo with two lists doesn't work

Problem:    Vim9: :echo with two lists doesn't work.
Solution:   Do not skip white space before []. (closes #6552)

src/testdir/test_vim9_expr.vim

@@ -1176,6 +1176,10 @@ def Test_expr7_list()
   assert_equal(g:list_mixed, [1, 'b', false,])
   assert_equal('b', g:list_mixed[1])
 
+  echo [1,
+  	2] [3,
+		4]
+
   call CheckDefExecFailure(["let x = g:anint[3]"], 'E714:')
   call CheckDefFailure(["let x = g:list_mixed[xxx]"], 'E1001:')
   call CheckDefFailure(["let x = [1,2,3]"], 'E1069:')
@@ -1193,6 +1197,10 @@ def Test_expr7_list_vim9script()
 		22,
 		]
       assert_equal([11, 22], l)
+
+      echo [1,
+	    2] [3,
+		    4]
   END
   CheckScriptSuccess(lines)
 

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1331,
 /**/
     1330,
 /**/

src/vim9compile.c

@@ -3855,7 +3855,7 @@ compile_subscript(
 		    return FAIL;
 	    }
 	}
-	else if (*p == '[')
+	else if (**arg == '[')
 	{
 	    garray_T	*stack = &cctx->ctx_type_stack;
 	    type_T	**typep;