[Code Comments]enum COPY_NEW_FE is removed

[Zhang Mingli]

Hi,

Enum COPY_NEW_FE is removed in commit 3174d69fb9.

Should use COPY_FRONTEND instead.

Issue exists on 15 and master.

```
typedef struct CopyFromStateData

- StringInfo fe_msgbuf; /* used if copy_src == COPY_NEW_FE */
+ StringInfo fe_msgbuf; /* used if copy_src == COPY_FRONTEND */

```

Regards,
Zhang Mingli

v-0001-Fix-code-comments-COPY_FRONTEND.patch
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