Make the widget option on the PopupContainer full width

The width of the PopupContainer grows if there are multiple
SystemShortcuts and we where not updating the width of all the
options.

Fix: 227538975
Test: Long press an app like Google Maps on the HomeScreen to see
the menu. All the options should have the same width.

Change-Id: I25310d74aa1af17be37b53c27d2334f86bef325a