Fix MyPlaces: use && instead of ST_Intersects

[jampukka]

MyPlaceMapper#findAllByBBOX got broken in #1194

[ZakarFin]

This makes userlayer and myplaces behave the same way and fixes an error:

### Error querying database.  Cause: org.postgresql.util.PSQLException: ERROR: ST_Intersects: Operation on mixed SRID geometries (Polygon, 0) != (MultiPolygon, 3857)
### The error may exist in fi/nls/oskari/myplaces/MyPlaceMapper.java (best guess)
### The error may involve fi.nls.oskari.myplaces.MyPlaceMapper.findAllByBBOX-Inline
### The error occurred while setting parameters
### SQL: SELECT  id,  uuid,  category_id,  name,  attention_text,  created,  updated,  place_desc,  link,  image_url,  ST_ASTEXT(geometry) as wkt,  ST_SRID(geometry) as srid  FROM my_places  WHERE  category_id = ?  AND  ST_INTERSECTS(   ST_MAKEENVELOPE(?, ?, ?, ?),        geometry)
### Cause: org.postgresql.util.PSQLException: ERROR: ST_Intersects: Operation on mixed SRID geometries (Polygon, 0) != (MultiPolygon, 3857)