Fixing issue of multiple quality prefixes in summary

As Tpt noticed, my previous patch would case multiple quality prefixes,
if radiobuttons were clicked multiple time.
This patch eliminates the issue, in a way suggested by Tpt, with minor
modification to RegEx, so we don't add up spaces after quality prefix,
on multiple clicks.

Change-Id: I7c443df0594f40f31429d25d3191a9e3e07bbd7c
Merge "Fixing issue of multiple quality prefixes in summary"