Ieebc40073eb3d0c8a56ebc8aec3f060199943ddc lowers the breakpoint
at which search will break into 2 columns (search + interwiki),
in large part because the 2nd column will also be occupied by
Extension:SearchVue's side panel.
On mobile, Extension:SearchVue presents differently (directly
below a search result), so there's not as much need for a 2nd
column this early - wider search results are prefered.
Bug: T321377
Change-Id: I22c46cfad2e054be679d79cce9b8d1ae04e3c6f1
