Remove unused variable

[bagage]

No description provided.

[mmd-osm]

While you're at it: there's another issue here: 4cc57fb#comments

[bagage]

Readded @mmd-osm.

[mmd-osm]

That's not exactly what I meant, I should read std::string result = "(id:"; like it already was here:

Overpass-API/src/overpass_api/statements/id_query.h

Line 81 in 00e1c01

std::string result = "(id:";

Or even better would be something like:

std::string result = (refs.size() > 1 ? "(id:" : "(");

[bagage]

@mmd-osm Does it sound better now?