Remove link when changing an excerpt

[JustinBack]

(Taken from here https://forum.tosdr.org/t/phoenix-bug-when-amending-excerpts/56)

Basically, when changing an excerpt you cannot append existing text to the already used excerpt as phoenix disables the popup.

Possible fix would be to remove the link in an currently used excerpt when the GET parameter point_id is defined

if snippet[:pointId] == @point.id 

Not a ruby dev so ain't touching code :P