meta().id wrong when "id" is also used as column alias.

From couchbase-lite-C, issue#149

[INFO] | CBL | query: {Query#6}==> litecore::SQLiteQuery SELECT META().id AS id WHERE META().id = $ID @0x7fbb676188b0
[INFO] | CBL | query: {Query#6} Compiling N1QL query: SELECT META().id AS id WHERE META().id = $ID
[INFO] | CBL | query: {Query#6} Compiled as SELECT fl_result(_doc.key) AS id FROM kv_default AS _doc WHERE (id.key = $_ID) AND (_doc.flags & 1 = 0)
[SEVERE] | CBL | database: SQLite error (code 1): no such column: id.key in "SELECT fl_result(_doc.key) AS id FROM kv_default AS _doc WHERE (id.key = $_ID) AND (_doc.flags & 1 = 0)"
[SEVERE] | CBL | all: no such column: id.key (1/1)
[WARNING] | CBL | database: {DB#3} SQLite error compiling statement "SELECT fl_result(_doc.key) AS id FROM kv_default AS _doc WHERE (id.key = $_ID) AND (_doc.flags & 1 = 0)": no such column: id.key