bug#53419: 27.1; Occur edit mode should also handle RET properly before the line number

[ndame]

After the line number pressing RET jumps to the location even
in occur edit mode which is good behavior.

But if you press RET on the line number or before it in edit
mode then it inserts a newline, messing up the occur buffer.

RET should always jump to the location when pressed anywhere
on the line.