jquery.suggestions: Handle CSS ellipsis when calculating suggestions' widths

This is so nasty :(

Bug: 64093
Change-Id: Ia6b1376dddf69a0faa214d5c9a756bdcd9658367
(cherry picked from commit 271be3d09acfd3eb1cea3c0729b813c3d193c7df)
Merge "jquery.suggestions: Handle CSS ellipsis when calculating suggestions' widths" into wmf/1.24wmf1