Fix some minor glitches in fuzzy search sidebar:

1) In a fresh installation, the root albums in the album selection box in duplicates search are not automatically expanded.
Though this is no bug (expanding is possible via double-click), we now automatically expand the root albums to not confuse users.
if nothing was expanded, yet.
2) In duplicates search, the last similarity thresholds are saved. But after restart, one the range of the max similarity
threshold is 90-100 until the min similarity is changed. This is an ugly glitch. Fixed that.
3) The computation of the similar images had a glitch when max similarity = min similarity (e.g. 50%) The results were only
the ones with exactly 50.00 % but not also results with 50.xy as it should be. Fixed that.
4) The xml structure of the haar search queries for fuzzy and sketch search were not wellformed (the closing "search" tag was missing)

BUGS: 372972
CCBUGS: 353331