Bug 1400416: Don't strip showOnlyImportant=1 from perfherder URLs. (#2774)
Bug 1400416: Don't strip showOnlyImportant=1 from perfherder URLs. (#2774)

The default value for showOnlyImportant is 0, but currently showOnlyImportant=1
is stripped from the URL, because it's assumed to be the default, while
showOnlyImportant=0 is occasionally added.
edmorley/treeherder,tojon/treeherder,tojonmz/treeherder,tojon/treeherder,tojonmz/treeherder,edmorley/treeherder,KWierso/treeherder,tojonmz/treeherder,tojonmz/treeherder,tojonmz/treeherder,edmorley/treeherder,KWierso/treeherder,KWierso/treeherder,KWierso/treeherder,tojon/treeherder,tojonmz/treeherder,edmorley/treeherder,tojon/treeherder