patch 9.0.1509: error message lacks mentioning the erroneous argument

Problem:    Error message lacks mentioning the erroneous argument.
Solution:   Specify the argument that the error is for.

src/terminal.c

@@ -6562,7 +6562,7 @@ f_term_setansicolors(typval_T *argvars, typval_T *rettv UNUSED)
     if (argvars[1].vval.v_list->lv_first == &range_list_item
 	    || argvars[1].vval.v_list->lv_len != 16)
     {
-	emsg(_(e_invalid_argument));
+	semsg(_(e_invalid_value_for_argument_str), "\"colors\"");
 	return;
     }
 

src/testdir/test_terminal.vim

@@ -2188,6 +2188,7 @@ func Test_terminal_ansicolors_func()
   let colors[4] = 'Invalid'
   call assert_fails('call term_setansicolors(buf, colors)', 'E254:')
   call assert_fails('call term_setansicolors(buf, {})', 'E1211:')
+  call assert_fails('call term_setansicolors(buf, [])', 'E475: Invalid value for argument "colors"')
   set tgc&
 
   call StopShellInTerminal(buf)

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1509,
 /**/
     1508,
 /**/