orderBy generates too many spaces in the newQuery method

This R code

```r
# Create a new query
Pax6List = newQuery(
#here we're choosing which columns of data we'd like to see
view = c("Gene.primaryIdentifier",
"Gene.symbol"),
sortOrder = list("Gene.primaryIdentifier", "ASC"))

# Make a constraint:
listConstraint = setConstraints(
paths = c("Gene"),
operators = c("IN"),
values = list("PL_Pax6_Targets")
)

# Add the constraint to the query
Pax6List$where <- listConstraint
```

generates this XML:

```xml

```

Note that there are too many spaces in `sortOrder`. The space space BEFORE `Gene.primaryIdentifier` is ignored, but there is also a double space _between_ `Gene.primaryIdentifier` and `ASC`. This causes the InterMine server to throw a 400 error when it is run.