Take out wide breakpoint on item-groups
Take out wide breakpoint on item-groups

refs: CNVS-27362

Test Plan:
- Go to styleguide and "Item Groups"
- The size on the item group title is now 40% from 992px up

Screenshot - http://cl.ly/2k0H3X0C0q3k

Change-Id: Ic5179d027de52aebd90e7708cc47d97eb7076301
Reviewed-on: https://gerrit.instructure.com/74025
Tested-by: Jenkins
Reviewed-by: Pam Hiett <7b533437add1ce4ea4ed79979fa88e0e484e554b@instructure.com>
Product-Review: Pam Hiett <7b533437add1ce4ea4ed79979fa88e0e484e554b@instructure.com>
QA-Review: Gentry Beckmann <f487939f789774cca922ca5b886632de73477ea0@instructure.com>

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