Using lua module with lsp flag, but completion behavior is weird

### What did you expect to happen?

Consider some simple lua code:
```
local a =
{
[1] = 1,
[2] = 2,
[3] = 3,|
}
```
where `|` denotes the position of the cursor. After I typed the `,` before the cursor, I assume there would no completion offered, and if I type enter afterwards, it should insert a new line character and bring me to the next line.

### What actually happened?

Same situation as above, after I typed the `,` before the cursor, the completion list shows with some snippets options such as "bang" and "comment line". After that, if I keep typing space, the completion list is still there. However, I think after someone typing comma or space, it is not the right occasion to show the snippets completion list.

### Describe your attempts to resolve the issue

I tried to edit the source in `.emacs.d/modules/lang/lua/config.el` and I found there is configurations about company backends.

```
(set-company-backend! 'lua-mode '(company-lua company-yasnippet))
```

I tried to remove the `comapny-yasnippet` but it does not work.

### Steps to reproduce

You have to enable lua module and add lsp flag to it. The LSP server I use is lua-language-server, so you have to install it. Then just create a new lua source code file and write some random lua code, you will find the behavior of completion is so weird that it is so impractical.

### System Information

https://pastebin.com/YjARHxsY