patch 8.2.1879: Vim9: argument types of insert() not checked when compiling

Problem:    Vim9: argument types of insert() not checked when compiling.
Solution:   Add argument type checks for insert().
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 289b941..8ef1f08 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -1478,7 +1478,7 @@
     // Check the types of the arguments.
     argtypes = ((type_T **)stack->ga_data) + stack->ga_len - argcount;
     if (argcount > 0 && internal_func_check_arg_types(
-					*argtypes, func_idx, argcount) == FAIL)
+					argtypes, func_idx, argcount) == FAIL)
 	    return FAIL;
 
     if ((isn = generate_instr(cctx, ISN_BCALL)) == NULL)