Set correct default-value for offset

If a KML query does not have explicit offset, the system will choose
a value after the current result set (the code used is actually for
generating the "additional results..." link). Fix by giving offset
a default value of 0

Fixes bug 47355

Bug: 47355
Change-Id: I9798a255ec85c24f8535de0e0546371a5c59aa82
Merge "Set correct default-value for offset"